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Validate numerical

 
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Top Forums UNIX for Dummies Questions & Answers Validate numerical
# 8  
Old 11-21-2014
Code:
INPUT="123456"
case $INPUT in
    ( +([[:digit:]]) )   echo "INPUT is all numbers" ;;
    *)                   echo "INPUT is not all numbers" ;;
esac
INPUT="a123456"
case $INPUT in
    ( +([[:digit:]]) )   echo "INPUT is all numbers" ;;
    *)                   echo "INPUT is not all numbers" ;;
esac

# 9  
Old 11-21-2014
Quote:
Originally Posted by anbu23
Code:
    ( +([[:digit:]]) )   echo "INPUT is all numbers" ;;

This tests for digits, not numbers. "1234.56" or "-1" are both numbers but would fail your test. Not to mention your usage of character classes will work only in the "bash" shell, not in ksh88 or Bourne shell. It might work (not tested) in ksh93.

bakunin
# 10  
Old 11-21-2014
Variation to Akshay's shell suggestion:
Code:
isnum() { printf %f "${1:-NaN}" >/dev/null 2>&1;}

This User Gave Thanks to Scrutinizer For This Post:
Akshay Hegde
 
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