See the screen shot.
There is the '[' file at
What is the '[' file? What does it do?
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This command is for comparing values, checking file types etc.
NAME test, [ -- condition evaluation utility SYNOPSIS test expression [ expression ]
It's usually used like this:
if [ -f /etc/passwd ] then echo "Yes" else echo "No" fi
For more info, please read the man page (
man [ ).