-g FILE (conditional operator)

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

-u is for the set-user-id bit.

Links

• setuid on Wikipedia
• Bash manual
• POSIX specification of test

Examples

Different ways to test if a file has the SETGID bit set:

1 2 3 4

test -g ~/bin/cmd && echo "SETGID set" [ -g ~/bin/cmd ] && echo "SETGID set" # Bash [[ -g ~/bin/cmd ]] && echo "SETGID set"

Set the SETGID bit

1	chmod g+s /usr/local/bin/my-cmd