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Editorial Team
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Asked: 2026-05-31T01:00:45+00:00

I want to use math expression in IF clause – something like this: #!/bin/sh

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I want to use math expression in IF clause – something like this: 

         #!/bin/sh

         now=`date +%H%M`

         if [ $now % 5 -gt 0 ] ; then
           exit
         fi

         perl ...

What is a correct syntax for that?

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1 Answer

  1. Editorial Team
    if expr $now % 5 \> 0 > /dev/null; then ...

    or

    if test $(( $now % 5 )) -gt 0; then ...

    Note that you do not really need an if clause at all, and you could do

    test $(( $now % 5 )) -gt 0 && exit
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