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 — sanapala mohanarao
– sanapala mohanarao, Commented Jun 28, 2017 at 11:16

Dennis Williamson · Accepted Answer · 2010-11-19 18:12:52Z

78

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

Dennis Williamson

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answered Nov 19, 2010 at 8:41

Marcus Whybrow

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3 Comments

How is this less upvoted than -o? is there a drawback? it is insanely more readable

@Gulzar Most likely because of "I think" :)

Even more readable and more easy to write ;-) if [[ $uptime -lt 0 || $questions -lt 1 || $slow -gt 10 ]]; then some code fi

DarkDust · Accepted Answer · 2010-11-19 08:40:33Z

68

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

answered Nov 19, 2010 at 8:40

DarkDust

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