-N FILE (conditional operator)

true if the file exists and has been modified since it was last read.

-N is not included in POSIX.1-2017.

Examples

Different ways to test if a file was modified since it was last read:
1
2
3
4
test -N ~/file && echo "modified"
[ -N ~/file ] && echo "modified"
# Bash
[[ -N ~/file ]] && echo "modified"
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