using OR in shell script

Question

My shell script looks something like this...

if [[ $uptime -lt 0 ]];then
some code
fi

if [[ $questions -lt 1 ]];then
some code
fi

if [[ $slow -gt 10 ]];then
some code
fi

How do I use OR and have a single if clause?

Possible duplicate of [How to do a logical OR operation in Shell Scripting](https://stackoverflow.com/questions/4111475/how-to-do-a-logical-or-operation-in-shell-scripting) — sanapala mohanarao, Jun 28 '17 at 11:16

score 72 · Answer 1 · edited Nov 19 '10 at 18:12

72

You should be able to use || or -o I think as follows:

if [ $uptime -lt 0 ] || [ $questions -lt 1 ] || [ $slow -gt 10 ]; then
    some code
fi

edited Nov 19 '10 at 18:12

Dennis Williamson

answered Nov 19 '10 at 08:41

Marcus Whybrow

4

How is this less upvoted than `-o`? is there a drawback? it is insanely more readable – Gulzar Mar 07 '22 at 15:53
@Gulzar Most likely because of "I think" :) – trss Nov 19 '22 at 15:24

score 67 · Accepted Answer · answered Nov 19 '10 at 08:40

if [ $uptime -lt 0 -o $questions -lt 1 -o $slow -gt 10 ] ; then
    some code
fi

See man test for available syntax and options. The [ operator is just shorthand for test, so the above code is equivalent to:

if test $uptime -lt 0 -o $questions -lt 1 -o $slow -gt 10 ; then
    some code
fi

2 Answers2