ShellCheck codes supported by BashSupport Pro

These are all checks of ShellCheck supported by BashSupport Pro. Please refer to the manual page about ShellCheck to learn more about the available features.

Our Bash IDE supports highlighting of ShellCheck messages in the editor, suppression with # shellcheck comments, tooltips on codes like SC1000 and more. Please note, that the description were taken from the official ShellCheck wiki and the copyright of the English messages belongs to ShellCheck project, of course.

SC1000
$ is not used specially and should therefore be escaped.
SC1001
This \o will be a regular 'o' in this context.
SC1003
Want to escape a single quote? echo 'This is how it'\''s done'.
SC1004
This backslash+linefeed is literal. Break outside single quotes if you just want to break the line.
SC1007
Remove space after = if trying to assign a value (or for empty string, use var='' ... ).
SC1008
This shebang was unrecognized. ShellCheck only supports sh/bash/dash/ksh. Add a 'shell' directive to specify.
SC1009
The mentioned parser error was in ...
SC1010
Use semicolon or linefeed before done (or quote to make it literal).
SC1011
This apostrophe terminated the single quoted string!
SC1012
\t is just literal t here. For tab, use "$(printf '\t')" instead.
SC1014
Use if cmd; then .. to check exit code, or if [ "$(cmd)" = .. ] to check output.
SC1015
This is a unicode double quote. Delete and retype it.
SC1016
This is a Unicode single quote. Delete and retype it.
SC1017
Literal carriage return. Run script through tr -d '\r' .
SC1018
This is a unicode non-breaking space. Delete it and retype as space.
SC1019
Expected this to be an argument to the unary condition.
SC1020
You need a space before the ] or ]]
SC1026
If grouping expressions inside [[..]], use ( .. ).
SC1027
Expected another argument for this operator.
SC1028
In [..] you have to escape \( \) or preferably combine [..] expressions.
SC1029
In [[..]] you shouldn't escape ( or ).
SC1033
Test expression was opened with double [[ but closed with single ]. Make sure they match.
SC1034
Test expression was opened with double [ but closed with single ]]. Make sure they match.
SC1035
You need a space here
SC1036
( is invalid here. Did you forget to escape it?
SC1037
Braces are required for positionals over 9, e.g. ${10}.
SC1038
Shells are space sensitive. Use < <(cmd), not <<(cmd).
SC1039
Remove indentation before end token (or use <<- and indent with tabs).
SC1040
When using <<-, you can only indent with tabs.
SC1041
Found eof further down, but not on a separate line.
SC1042
Close matches include -eof (!= eof).
SC1043
Found EOF further down, but with wrong casing.
SC1044
Couldn't find end token EOF in the here document.
SC1045
It's not foo &; bar, just foo & bar.
SC1046
Couldn't find fi for this if.
SC1047
Expected fi matching previously mentioned if.
SC1048
Can't have empty then clauses (use true as a no-op).
SC1049
Did you forget the then for this if?
SC1050
Expected then.
SC1051
Semicolons directly after then are not allowed. Just remove it.
SC1052
Semicolons directly after then are not allowed. Just remove it.
SC1053
Semicolons directly after else are not allowed. Just remove it.
SC1054
You need a space after the {.
SC1055
You need at least one command here. Use true; as a no-op.
SC1056
Expected a }. If you have one, try a ; or \n in front of it.
SC1057
Did you forget the do for this loop?
SC1058
Expected do.
SC1059
Semicolon is not allowed directly after do. You can just delete it.
SC1060
Can't have empty do clauses (use true as a no-op)
SC1061
Couldn't find done for this do.
SC1062
Expected done matching previously mentioned do.
SC1063
You need a line feed or semicolon before the do.
SC1064
Expected a { to open the function definition.
SC1065
Trying to declare parameters? Don't. Use () and refer to params as $1, $2, ..
SC1066
Don't use $ on the left side of assignments.
SC1067
For indirection, use arrays, declare "var$n=value", or (for sh) read/eval
SC1068
Don't put spaces around the = in assignments.
SC1069
You need a space before the [.
SC1070
Parsing stopped here. Mismatched keywords or invalid parentheses?
SC1071
ShellCheck only supports sh/bash/dash/ksh scripts. Sorry!
SC1072
Unexpected ..
SC1073
Couldn't parse this (thing). Fix to allow more checks.
SC1074
Did you forget the ;; after the previous case item?
SC1075
Use elif instead of else if.
SC1076
Trying to do math? Use e.g. [ $((i/2+7)) -ge 18 ].
SC1077
For command expansion, the tick should slant left (` vs ´).
SC1078
Did you forget to close this double quoted string?
SC1079
This is actually an end quote, but due to next char it looks suspect.
SC1080
You need \ before line feeds to break lines in [ ].
SC1081
Scripts are case-sensitive. Use if, not If.
SC1082
This file has a UTF-8 BOM. Remove it with: LC_CTYPE=C sed '1s/^...//' < yourscript.
SC1083
This {/} is literal. Check if ; is missing or quote the expression.
SC1084
Use #!, not !#, for the shebang.
SC1086
Don't use $ on the iterator name in for loops.
SC1087
Use braces when expanding arrays, e.g. ${array[idx]} (or ${var}[.. to quiet).
SC1088
Parsing stopped here. Invalid use of parentheses?
SC1089
Parsing stopped here. Is this keyword correctly matched up?
SC1090
Can't follow non-constant source. Use a directive to specify location.
SC1091
Not following: (error message here)
SC1092
Stopping at 100 source frames :O
SC1094
Parsing of sourced file failed. Ignoring it.
SC1095
You need a space or linefeed between the function name and body.
SC1097
Unexpected ==. For assignment, use =. For comparison, use [/[[.
SC1098
Quote/escape special characters when using eval, e.g. eval "a=(b)".
SC1099
You need a space before the #.
SC1100
This is a unicode dash. Delete and retype as ASCII minus.
SC1101
Delete trailing spaces after \ to break line (or use quotes for literal space).
SC1102
Shells disambiguate $(( differently or not at all. For $(command substitution), add space after $( . For $((arithmetics)), fix parsing errors.
SC1103
This shell type is unknown. Use e.g. sh or bash.
SC1104
Use #!, not just !, for the shebang.
SC1105
Shells disambiguate (( differently or not at all. If the first ( should start a subshell, add a space after it.
SC1106
In arithmetic contexts, use < instead of -lt
SC1107
This directive is unknown. It will be ignored.
SC1108
You need a space before and after the = .
SC1109
This is an unquoted HTML entity. Replace with corresponding character.
SC1110
This is a unicode quote. Delete and retype it (or quote to make literal).
SC1111
This is a unicode quote. Delete and retype it (or ignore/singlequote for literal).
SC1112
This is a unicode quote. Delete and retype it (or ignore/doublequote for literal).
SC1113
Use #!, not just #, for the shebang.
SC1114
Remove leading spaces before the shebang.
SC1115
Remove spaces between # and ! in the shebang.
SC1116
Missing $ on a $((..)) expression? (or use ( ( for arrays).
SC1117
Backslash is literal in "\n". Prefer explicit escaping: "\\n".
SC1118
Delete whitespace after the here-doc end token.
SC1119
Add a linefeed between end token and terminating ).
SC1120
No comments allowed after here-doc token. Comment the next line instead.
SC1121
Add ;/& terminators (and other syntax) on the line with the <<, not here.
SC1122
Nothing allowed after end token. To continue a command, put it on the line with the <<.
SC1123
ShellCheck directives are only valid in front of complete compound commands, like if, not e.g. individual elif branches.
SC1124
ShellCheck directives are only valid in front of complete commands like case statements, not individual case branches.
SC1125
Invalid key=value pair in directive
SC1126
Place shellcheck directives before commands, not after.
SC1127
Was this intended as a comment? Use # in sh.
SC1128
The shebang must be on the first line. Delete blanks and move comments.
SC1129
You need a space before the !.
SC1130
You need a space before the :.
SC1131
Use elif to start another branch.
SC1132
This & terminates the command. Escape it or add space after & to silence.
SC1133
Unexpected start of line. If breaking lines, |/||/&& should be at the end of the previous one.
SC1134
Error parsing shellcheckrc:
SC1135
Prefer escape over ending quote to make $ literal. Instead of "It costs $"5, use "It costs \$5"
SC1136
Unexpected characters after terminating ]. Missing semicolon/linefeed?
SC1137
Missing second ( to start arithmetic for ((;;)) loop
SC1138
Shells are space sensitive. Use < <(cmd), not << (cmd).
SC1139
Use || instead of -o between test commands.
SC1140
Unexpected parameters after condition. Missing &&/||, or bad expression?
SC1141
Unexpected tokens after compound command. Bad redirection or missing ;/&&/||/|?
SC1142
Use done < <(cmd) to redirect from process substitution (currently missing one <).
SC1143
This backslash is part of a comment and does not continue the line.
SC1144
external-sources can only be enabled in .shellcheckrc, not in individual files.
SC1145
Unknown external-sources value. Expected true/false.
SC2000
See if you can use ${#variable} instead
SC2001
See if you can use ${variable//search/replace} instead.
SC2002
Useless cat. Consider cmd < file | .. or cmd file | .. instead.
SC2003
expr is antiquated. Consider rewriting this using $((..)), ${} or [[ ]].
SC2004
$/${} is unnecessary on arithmetic variables.
SC2005
Useless echo? Instead of echo $(cmd), just use cmd
SC2006
Use $(...) notation instead of legacy backticked `...`.
SC2007
Use $((..)) instead of deprecated $[..].
SC2008
echo doesn't read from stdin, are you sure you should be piping to it?
SC2009
Consider using pgrep instead of grepping ps output.
SC2010
Don't use ls | grep. Use a glob or a for loop with a condition to allow non-alphanumeric filenames.
SC2011
Use find -print0 or find -exec to better handle non-alphanumeric filenames.
SC2012
Use find instead of ls to better handle non-alphanumeric filenames.
SC2013
To read lines rather than words, pipe/redirect to a while read loop.
SC2014
This will expand once before find runs, not per file found.
SC2015
Note that A && B || C is not if-then-else. C may run when A is true.
SC2016
Expressions don't expand in single quotes, use double quotes for that.
SC2017
Increase precision by replacing a/b*c with a*c/b.
SC2018
Use [:lower:] to support accents and foreign alphabets.
SC2019
Use [:upper:] to support accents and foreign alphabets.
SC2020
tr replaces sets of chars, not words (mentioned due to duplicates).
SC2021
Don't use [] around ranges in tr, it replaces literal square brackets.
SC2022
Note that unlike globs, o* here matches ooo but not oscar.
SC2023
The shell may override time as seen in man time(1). Use command time .. for that one.
SC2024
sudo doesn't affect redirects. Use ..| sudo tee file
SC2025
Make sure all escape sequences are enclosed in \[..\] to prevent line wrapping issues.
SC2026
This word is outside of quotes. Did you intend to 'nest '"'single quotes'"' instead'?
SC2027
The surrounding quotes actually unquote this. Remove or escape them.
SC2028
echo won't expand escape sequences. Consider printf.
SC2029
Note that, unescaped, this expands on the client side.
SC2030
Modification of var is local (to subshell caused by pipeline).
SC2031
var was modified in a subshell. That change might be lost.
SC2032
This function can't be invoked via su on line 42.
SC2033
Shell functions can't be passed to external commands. Use separate script or sh -c.
SC2034
foo appears unused. Verify it or export it.
SC2035
Use ./*glob* or -- *glob* so names with dashes won't become options.
SC2036
If you wanted to assign the output of the pipeline, use a=$(b | c) .
SC2037
To assign the output of a command, use var=$(cmd) .
SC2038
Use -print0/-0 or find -exec + to allow for non-alphanumeric filenames.
SC2039
In POSIX sh, *something* is undefined.
SC2040
#!/bin/sh was specified, so ____ is not supported, even when sh is actually bash.
SC2041
This is a literal string. To run as a command, use $(..) instead of '..' .
SC2042
Use spaces, not commas, to separate loop elements.
SC2043
This loop will only ever run once for a constant value. Did you perhaps mean to loop over dir/*, $var or $(cmd)?
SC2044
For loops over find output are fragile. Use find -exec or a while read loop.
SC2045
Iterating over ls output is fragile. Use globs.
SC2046
Quote this to prevent word splitting.
SC2048
Use "$@" (with quotes) to prevent whitespace problems.
SC2049
=~ is for regex, but this looks like a glob. Use = instead.
SC2050
This expression is constant. Did you forget the $ on a variable?
SC2051
Bash doesn't support variables in brace range expansions.
SC2053
Quote the rhs of = in [[ ]] to prevent glob matching.
SC2054
Use spaces, not commas, to separate array elements.
SC2055
You probably wanted && here, otherwise it's always true.
SC2056
You probably wanted && here
SC2057
Unknown binary operator.
SC2058
Unknown unary operator.
SC2059
Don't use variables in the printf format string. Use printf "..%s.." "$foo".
SC2060
Quote parameters to tr to prevent glob expansion.
SC2061
Quote the parameter to -name so the shell won't interpret it.
SC2062
Quote the grep pattern so the shell won't interpret it.
SC2063
Grep uses regex, but this looks like a glob.
SC2064
Use single quotes, otherwise this expands now rather than when signalled.
SC2065
This is interpreted as a shell file redirection, not a comparison.
SC2066
Since you double quoted this, it will not word split, and the loop will only run once.
SC2067
Missing ; or + terminating -exec. You can't use |/||/&&, and ; has to be a separate, quoted argument.
SC2068
Double quote array expansions to avoid re-splitting elements.
SC2069
To redirect stdout+stderr, 2>&1 must be last (or use { cmd > file; } 2>&1 to clarify).
SC2070
-n doesn't work with unquoted arguments. Quote or use [[ ]].
SC2071
> is for string comparisons. Use -gt instead.
SC2072
Decimals are not supported. Either use integers only, or use bc or awk to compare.
SC2073
Escape \< to prevent it redirecting (or switch to [[ .. ]]).
SC2074
Can't use =~ in [ ]. Use [[..]] instead.
SC2075
Escaping \< is required in [..], but invalid in [[..]]
SC2076
Don't quote rhs of =~, it'll match literally rather than as a regex.
SC2077
You need spaces around the comparison operator.
SC2078
This expression is constant. Did you forget a $ somewhere?
SC2079
(( )) doesn't support decimals. Use bc or awk.
SC2080
Numbers with leading 0 are considered octal.
SC2081
[ .. ] can't match globs. Use [[ .. ]] or grep.
SC2082
To expand via indirection, use name="foo$n"; echo "${!name}".
SC2083
Don't add spaces after the slash in ./file.
SC2084
Remove $ or use _=$((expr)) to avoid executing output.
SC2086
Double quote to prevent globbing and word splitting.
SC2087
Quote EOF to make here document expansions happen on the server side rather than on the client.
SC2088
Tilde does not expand in quotes. Use $HOME.
SC2089
Quotes/backslashes will be treated literally. Use an array.
SC2090
Quotes/backslashes in this variable will not be respected.
SC2091
Remove surrounding $() to avoid executing output (or use eval if intentional).
SC2092
Remove backticks to avoid executing output.
SC2093
Remove exec if script should continue after this command.
SC2094
Make sure not to read and write the same file in the same pipeline.
SC2095
Use ssh -n to prevent ssh from swallowing stdin.
SC2096
On most OS, shebangs can only specify a single parameter.
SC2097
This assignment is only seen by the forked process.
SC2098
This expansion will not see the mentioned assignment.
SC2099
Use $((..)) for arithmetics, e.g. i=$((i + 2))
SC2100
Use $((..)) for arithmetics, e.g. i=$((i + 2))
SC2101
Named class needs outer [], e.g. [[:digit:]].
SC2102
Ranges can only match single chars (mentioned due to duplicates).
SC2103
Use a ( subshell ) to avoid having to cd back.
SC2104
In functions, use return instead of break.
SC2105
break is only valid in loops
SC2106
This only exits the subshell caused by the pipeline.
SC2107
Instead of [ a && b ], use [ a ] && [ b ].
SC2108
In [[..]], use && instead of -a.
SC2109
Instead of [ a || b ], use [ a ] || [ b ].
SC2110
In [[..]], use || instead of -o.
SC2111
ksh does not allow function keyword and () at the same time.
SC2112
function keyword is non-standard. Delete it.
SC2113
function keyword is non-standard. Use foo() instead of function foo.
SC2114
Warning: deletes a system directory.
SC2115
Use "${var:?}" to ensure this never expands to /* .
SC2116
Useless echo? Instead of cmd $(echo foo), just use cmd foo.
SC2117
To run commands as another user, use su -c or sudo.
SC2118
Ksh does not support |&. Use 2>&1 |
SC2119
Use foo "$@" if function's $1 should mean script's $1.
SC2120
foo references arguments, but none are ever passed.
SC2121
To assign a variable, use just var=value, not set ...
SC2122
>= is not a valid operator. Use ! a < b instead.
SC2123
PATH is the shell search path. Use another name.
SC2124
Assigning an array to a string! Assign as array, or use * instead of @ to concatenate.
SC2125
Brace expansions and globs are literal in assignments. Quote it or use an array.
SC2126
Consider using grep -c instead of grep | wc
SC2127
To use ${ ..; }, specify #!/usr/bin/env ksh.
SC2128
Expanding an array without an index only gives the first element.
SC2129
Consider using { cmd1; cmd2; } >> file instead of individual redirects.
SC2130
-eq is for integer comparisons. Use = instead.
SC2139
This expands when defined, not when used. Consider escaping.
SC2140
Word is of the form "A"B"C" (B indicated). Did you mean "ABC" or "A\\"B\\"C"?
SC2141
Did you mean IFS=$'\t' ?
SC2142
Aliases can't use positional parameters. Use a function.
SC2143
Use grep -q instead of comparing output with [ -n .. ].
SC2144
-e doesn't work with globs. Use a for loop.
SC2145
Argument mixes string and array. Use * or separate argument.
SC2146
This action ignores everything before the -o. Use \( \) to group.
SC2147
Literal tilde in PATH works poorly across programs.
SC2148
Tips depend on target shell and yours is unknown. Add a shebang.
SC2149
Remove $/${} for numeric index, or escape it for string.
SC2150
-exec does not automatically invoke a shell. Use -exec sh -c .. for that.
SC2151
Only one integer 0-255 can be returned. Use stdout for other data.
SC2152
Can only return 0-255. Other data should be written to stdout.
SC2153
Possible Misspelling: MYVARIABLE may not be assigned. Did you mean MY_VARIABLE?
SC2154
var is referenced but not assigned.
SC2155
Declare and assign separately to avoid masking return values.
SC2156
Injecting filenames is fragile and insecure. Use parameters.
SC2157
Argument to implicit -n is always true due to literal strings.
SC2158
[ false ] is true. Remove the brackets
SC2159
[ 0 ] is true. Use false instead.
SC2160
Instead of [ true ], just use true.
SC2161
Instead of [ 1 ], use true.
SC2162
read without -r will mangle backslashes.
SC2163
This does not export FOO. Remove $/${} for that, or use ${var?} to quiet.
SC2164
Use cd ... || exit in case cd fails.
SC2165
This nested loop overrides the index variable of its parent.
SC2166
Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.
SC2167
This parent loop has its index variable overridden.
SC2168
local is only valid in functions.
SC2169
In dash, *something* is not supported.
SC2170
Invalid number for -eq. Use = to compare as string (or use $var to expand as a variable).
SC2171
Found trailing ] outside test. Add missing [ or quote if intentional.
SC2172
Trapping signals by number is not well defined. Prefer signal names.
SC2173
SIGKILL/SIGSTOP can not be trapped.
SC2174
When used with -p, -m only applies to the deepest directory.
SC2175
Quote this invalid brace expansion since it should be passed literally to eval
SC2176
time is undefined for pipelines. time single stage or bash -c instead.
SC2177
time is undefined for compound commands, use time sh -c instead.
SC2178
Variable was used as an array but is now assigned a string.
SC2179
Use array+=("item") to append items to an array.
SC2180
Bash does not support multidimensional arrays. Use 1D or associative arrays.
SC2181
Check exit code directly with e.g. if mycmd;, not indirectly with $?.
SC2182
This printf format string has no variables. Other arguments are ignored.
SC2183
This format string has 2 variables, but is passed 1 arguments.
SC2184
Quote arguments to unset so they're not glob expanded.
SC2185
Some finds don't have a default path. Specify . explicitly.
SC2186
tempfile is deprecated. Use mktemp instead.
SC2187
Ash scripts will be checked as Dash. Add # shellcheck shell=dash to silence.
SC2188
This redirection doesn't have a command. Move to its command (or use true as no-op).
SC2189
You can't have | between this redirection and the command it should apply to.
SC2190
Elements in associative arrays need index, e.g. array=( [index]=value ) .
SC2191
The = here is literal. To assign by index, use ( [index]=value ) with no spaces. To keep as literal, quote it.
SC2192
This array element has no value. Remove spaces after = or use "" for empty string.
SC2193
The arguments to this comparison can never be equal. Make sure your syntax is correct.
SC2194
This word is constant. Did you forget the $ on a variable?
SC2195
This pattern will never match the case statement's word. Double check them.
SC2196
egrep is non-standard and deprecated. Use grep -E instead.
SC2197
fgrep is non-standard and deprecated. Use grep -F instead.
SC2198
Arrays don't work as operands in [ ]. Use a loop (or concatenate with * instead of @).
SC2199
Arrays implicitly concatenate in [[ ]]. Use a loop (or explicit * instead of @).
SC2200
Brace expansions don't work as operands in [ ]. Use a loop.
SC2201
Brace expansion doesn't happen in [[ ]]. Use a loop.
SC2202
Globs don't work as operands in [ ]. Use a loop.
SC2203
Globs are ignored in [[ ]] except right of =/!=. Use a loop.
SC2204
(..) is a subshell. Did you mean [ .. ], a test expression?
SC2205
(..) is a subshell. Did you mean [ .. ], a test expression?
SC2206
Quote to prevent word splitting/globbing, or split robustly with mapfile or read -a.
SC2207
Prefer mapfile or read -a to split command output (or quote to avoid splitting).
SC2208
Use [[ ]] or quote arguments to -v to avoid glob expansion.
SC2209
Use var=$(command) to assign output (or quote to assign string).
SC2210
This is a file redirection. Was it supposed to be a comparison or fd operation?
SC2211
This is a glob used as a command name. Was it supposed to be in ${..}, array, or is it missing quoting?
SC2212
Use false instead of empty [/[[ conditionals.
SC2213
getopts specified -n, but it's not handled by this case.
SC2214
This case is not specified by getopts.
SC2215
This flag is used as a command name. Bad line break or missing [ .. ]?
SC2216
Piping to rm, a command that doesn't read stdin. Wrong command or missing xargs?
SC2217
Redirecting to echo, a command that doesn't read stdin. Bad quoting or missing xargs?
SC2218
This function is only defined later. Move the definition up.
SC2219
Instead of let expr, prefer (( expr )) .
SC2220
Invalid flags are not handled. Add a *) case.
SC2221
This pattern always overrides a later one.
SC2222
This pattern never matches because of a previous pattern.
SC2223
This default assignment may cause DoS due to globbing. Quote it.
SC2224
This mv has no destination. Check the arguments.
SC2225
This cp has no destination. Check the arguments.
SC2226
This ln has no destination. Check the arguments, or specify . explicitly.
SC2227
Redirection applies to the find command itself. Rewrite to work per action (or move to end).
SC2229
This does not read foo. Remove $/${} for that, or use ${var?} to quiet.
SC2230
which is non-standard. Use builtin command -v instead.
SC2231
Quote expansions in this for loop glob to prevent wordsplitting, e.g. "$dir"/*.txt .
SC2232
Can't use sudo with builtins like cd. Did you want sudo sh -c .. instead?
SC2233
Remove superfluous (..) around condition to avoid subshell overhead.
SC2234
Remove superfluous (..) around test command to avoid subshell overhead.
SC2235
Use { ..; } instead of (..) to avoid subshell overhead.
SC2236
Use -n instead of ! -z.
SC2237
Use [ -n .. ] instead of ! [ -z .. ].
SC2238
Redirecting to/from command name instead of file. Did you want pipes/xargs (or quote to ignore)?
SC2239
Ensure the shebang uses the absolute path to the interpreter.
SC2240
The dot command does not support arguments in sh/dash. Set them as variables.
SC2241
The exit status can only be one integer 0-255. Use stdout for other data.
SC2242
Can only exit with status 0-255. Other data should be written to stdout/stderr.
SC2243
Prefer explicit -n to check for output (or run command without [/[[ to check for success)
SC2244
Prefer explicit -n to check non-empty string (or use =/-ne to check boolean/integer).
SC2245
-d only applies to the first expansion of this glob. Use a loop to check any/all.
SC2246
This shebang specifies a directory. Ensure the interpreter is a file.
SC2247
Flip leading $ and " if this should be a quoted substitution.
SC2248
Prefer double quoting even when variables don't contain special characters.
SC2249
Consider adding a default *) case, even if it just exits with error.
SC2250
Prefer putting braces around variable references even when not strictly required.
SC2251
This ! is not on a condition and skips errexit. Use && exit 1 instead, or make sure $? is checked.
SC2252
You probably wanted && here, otherwise it's always true.
SC2253
Use -R to recurse, or explicitly a-r to remove read permissions.
SC2254
Quote expansions in case patterns to match literally rather than as a glob.
SC2255
[ ] does not apply arithmetic evaluation. Evaluate with $((..)) for numbers, or use string comparator for strings.
SC2256
This translated string is the name of a variable. Flip leading $ and " if this should be a quoted substitution.
SC2257
Arithmetic modifications in command redirections may be discarded. Do them separately.
SC2259
This redirection overrides piped input. To use both, merge or pass filenames.
SC2260
This redirection overrides the output pipe. Use tee to output to both.
SC2261
Multiple redirections compete for stdout. Use cat, tee, or pass filenames instead.
SC2262
This alias can't be defined and used in the same parsing unit. Use a function instead.
SC2263
Since they're in the same parsing unit, this command will not refer to the previously mentioned alias.
SC2264
This function unconditionally re-invokes itself. Missing command?
SC2265
Use && for logical AND. Single & will background and return true.
SC2266
Use && for logical AND. Single & will background and return true.
SC2267
GNU xargs -i is deprecated in favor of -I{}
SC2268
Avoid x-prefix in comparisons as it no longer serves a purpose.
SC2269
This variable is assigned to itself, so the assignment does nothing.
SC2270
To assign positional parameters, use set -- first second .. (or use [ ] to compare).
SC2271
For indirection, use arrays, declare "var$n=value", or (for sh) read/eval
SC2272
Command name contains ==. For comparison, use [ "$var" = value ].
SC2273
Sequence of ===s found. Merge conflict or intended as a commented border?
SC2274
Command name starts with ===. Intended as a commented border?
SC2275
Command name starts with =. Bad line break?
SC2276
This is interpreted as a command name containing =. Bad assignment or comparison?
SC2277
Use BASH_ARGV0 to assign to $0 in bash (or use [ ] to compare).
SC2278
$0 can't be assigned in Ksh (but it does reflect the current function).
SC2279
$0 can't be assigned in Dash. This becomes a command name.
SC2280
$0 can't be assigned this way, and there is no portable alternative.
SC2281
Don't use $/${} on the left side of assignments.
SC2282
Variable names can't start with numbers, so this is interpreted as a command.
SC2283
Use [ ] to compare values, or remove spaces around = to assign (or quote '=' if literal).
SC2284
Use [ x = y ] to compare values (or quote '==' if literal).
SC2285
Remove spaces around += to assign (or quote '+=' if literal).
SC2286
This empty string is interpreted as a command name. Double check syntax (or use 'true' as a no-op).
SC2287
This is interpreted as a command name ending with '/'. Double check syntax.
SC2288
This is interpreted as a command name ending with apostrophe. Double check syntax.
SC2289
This is interpreted as a command name containing a linefeed. Double check syntax.
SC2290
Remove spaces around = to assign.
SC2291
Quote repeated spaces to avoid them collapsing into one.
SC2292
Prefer [[ ]] over [ ] for tests in Bash/Ksh.
SC2293
When eval'ing @Q-quoted words, use * rather than @ as the index.
SC2294
eval negates the benefit of arrays. Drop eval to preserve whitespace/symbols (or eval as string).
SC2295
Expansions inside ${..} need to be quoted separately, otherwise they will match as a pattern.
SC2296
Parameter expansions can't start with {. Double check syntax.
SC2297
Double quotes must be outside ${}: ${"invalid"} vs "${valid}".
SC2298
${$x} is invalid. For expansion, use ${x}. For indirection, use arrays, ${!x} or (for sh) eval.
SC2299
Parameter expansions can't be nested. Use temporary variables.
SC2300
Parameter expansion can't be applied to command substitutions. Use temporary variables.
SC2301
Parameter expansion starts with unexpected quotes. Double check syntax.
SC2302
This loops over values. To loop over keys, use "${!array[@]}".
SC2303
i is an array value, not a key. Use directly or loop over keys instead.
SC2304
* must be escaped to multiply: \*. Modern $((x * y)) avoids this issue.
SC2305
Quote regex argument to expr to avoid it expanding as a glob.
SC2306
Escape glob characters in arguments to expr to avoid pathname expansion.
SC2307
'expr' expects 3+ arguments but sees 1. Make sure each operator/operand is a separate argument, and escape <>&|.
SC2308
expr length has unspecified results. Prefer ${#var}.
SC2309
-eq treats this as a variable. Use = to compare as string (or expand explicitly with $var)
SC2310
This function is invoked in an 'if' condition so set -e will be disabled. Invoke separately if failures should cause the script to exit.
SC2311
Bash implicitly disabled set -e for this function invocation because it's inside a command substitution. Add set -e; before it or enable inherit_errexit.
SC2312
Consider invoking this command separately to avoid masking its return value (or use '|| true' to ignore).
SC2313
Quote array indices to avoid them expanding as globs.
SC2314
In bats, ! does not cause a test failure.
SC2315
In bats, ! does not cause a test failure. Fold the ! into the conditional!
SC2316
This applies local to the variable named readonly, which is probably not what you want. Use a separate command or the appropriate declare options instead.
SC2317
Command appears to be unreachable. Check usage (or ignore if invoked indirectly).
SC2318
This assignment is used again in this declare, but won't have taken effect. Use two declares.
SC2319
This $? refers to a condition, not a command. Assign to a variable to avoid it being overwritten.
SC2320
This $? refers to echo/printf, not a previous command. Assign to variable to avoid it being overwritten.
SC2321
Array indices are already arithmetic contexts. Prefer removing the $(( and )).
SC2322
In arithmetic contexts, ((x)) is the same as (x). Prefer only one layer of parentheses.
SC2323
a[(x)] is the same as a[x]. Prefer not wrapping in additional parentheses.
SC3001
In POSIX sh, process substitution is undefined.
SC3002
In POSIX sh, extglob is undefined.
SC3003
In POSIX sh, $'..' is undefined.
SC3004
In POSIX sh, $".." is undefined
SC3005
In POSIX sh, arithmetic for loops are undefined.
SC3006
In POSIX sh, standalone ((..)) is undefined.
SC3007
In POSIX sh, $[..] in place of $((..)) is undefined.
SC3008
In POSIX sh, select loops are undefined.
SC3009
In POSIX sh, brace expansion is undefined.
SC3010
In POSIX sh, [[ ]] is undefined.
SC3011
In POSIX sh, here-strings are undefined.
SC3012
In POSIX sh, lexicographical \< is undefined.
SC3013
In POSIX sh, -nt is undefined.
SC3014
In POSIX sh, == in place of = is undefined.
SC3015
In POSIX sh, =~ regex matching is undefined.
SC3016
In POSIX sh, unary -v (in place of [ -n "${var+x}" ]) is undefined.
SC3017
In POSIX sh, unary -a in place of -e is undefined.
SC3018
In POSIX sh, ++ is undefined.
SC3019
In POSIX sh, exponentials are undefined.
SC3020
In POSIX sh, &> is undefined.
SC3021
In POSIX sh, >& filename (as opposed to >& fd) is undefined.
SC3022
In POSIX sh, named file descriptors is undefined.
SC3023
In POSIX sh, FDs outside of 0-9 are undefined.
SC3024
In POSIX sh, += is undefined.
SC3025
In POSIX sh, /dev/{tcp,udp} is undefined.
SC3026
In POSIX sh, ^ in place of ! in glob bracket expressions is undefined.
SC3028
In POSIX sh, VARIABLE is undefined.
SC3029
In POSIX sh, |& in place of 2>&1 | is undefined.
SC3030
In POSIX sh, arrays are undefined.
SC3031
In POSIX sh, redirecting from/to globs is undefined.
SC3032
In POSIX sh, coproc is undefined.
SC3033
In POSIX sh, naming functions outside [a-zA-Z_][a-zA-Z0-9_]* is undefined.
SC3034
In POSIX sh, $(<file) is undefined.
SC3035
In POSIX sh, `<file` is undefined.
SC3036
In Dash, echo flags besides -n are not supported.
SC3037
In POSIX sh, echo flags are undefined.
SC3038
In POSIX sh, exec flags are undefined.
SC3039
In POSIX sh, let is undefined.
SC3040
In POSIX sh, set option *[name]* is undefined.
SC3041
In POSIX sh, set flag -E is undefined
SC3042
In POSIX sh, set flag --default is undefined
SC3043
In POSIX sh, local is undefined.
SC3044
In POSIX sh, declare is undefined.
SC3045
In POSIX sh, some-command-with-flag is undefined.
SC3046
In POSIX sh, source in place of . is undefined.
SC3047
In POSIX sh, trapping ERR is undefined.
SC3048
In POSIX sh, prefixing signal names with 'SIG' is undefined.
SC3049
In POSIX sh, using lower/mixed case for signal names is undefined.
SC3050
In POSIX sh, printf %q is undefined.
SC3051
In POSIX sh, source in place of . is undefined
SC3052
In POSIX sh, arithmetic base conversion is undefined
SC3053
In POSIX sh, indirect expansion is undefined.
SC3054
In POSIX sh, array references are undefined.
SC3055
In POSIX sh, array key expansion is undefined.
SC3056
In POSIX sh, name matching prefixes are undefined.
SC3057
In POSIX sh, string indexing is undefined.
SC3059
Case modification is not supported in dash and undefined in POSIX sh.
SC3060
In POSIX sh, string replacement is undefined.

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