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variable numerical test

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# 1  
Old 01-05-2009
variable numerical test
Hi

I have a variable which should be any number between 1 and 50.

It could also be any string/empty string.

I have a code written below. The point is when the variable contains string.
I don't want the code below to error out. Instead fall in the else bucket.

Code:
[ $var -lt 1 -o $var -gt 50 ] && dothis_1 || dothis_2

# 2  
Old 01-06-2009
Quote:
Originally Posted by tostay2003
Hi

I have a variable which should be any number between 1 and 50.

It could also be any string/empty string.

I have a code written below. The point is when the variable contains string.
I don't want the code below to error out. Instead fall in the else bucket.

You don't have an "else bucket"; dothis_2 will be executed if either the numerical test or dothis_1 fails.
Quote:
Code:
[ $var -lt 1 -o $var -gt 50 ] && dothis_1 || dothis_2


Code:
if case $var in
  *[!0-9]* | "" ) false ;;
  *) true ;;
esac && [ $var -ge 1 ] && [ $var -le 50 ]
then
  echo dothis_1
else
  echo dothis_2
fi

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