user6066403 user6066403 - 6 months ago 19
Bash Question

How to write if else in one line in shell?

I would like to write in one line this:

if [$SERVICESTATEID$ -eq 2]; then echo "CRITICAL"; else echo "OK"; fi


So to do a test in my shell I did:

if [2 -eq 3]; then echo "CRITICAL"; else echo "OK"; fi


The result is

-bash: [2: command not found
OK


So it doesn't work.

Answer

Space -- the final frontier. This works:

if [ $SERVICESTATEID -eq 2 ]; then echo "CRITICAL"; else echo "OK"; fi

Note spaces after [ and before ] -- [ is a command name! And I removed an extra $ at the end of $SERVICESTATEID.

An alternative is to spell out test. Then you don't need the final ], which is what I prefer:

if test $SERVICESTATEID -eq 2; then echo "CRITICAL"; else echo "OK"; fi