-u FILE (conditional operator)

true if the file exists and its set-user-id bit is set, i.e. the SETUID bit. false if FILE does not exist or does not have the SETUID bit set.

-g is for the set-group-id bit.

Examples

Different ways to test if a file has the SETUID bit set:
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2
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test -u ~/bin/cmd && echo "SETUID set"
[ -u ~/bin/cmd ] && echo "SETUID set"
# Bash
[[ -u ~/bin/cmd ]] && echo "SETUID set"
Set the SETUID bit:
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chmod u+s /usr/local/bin/my-cmd
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