check whether variable number or string

rolex.mp · #1 (**permalink**) 02-21-2007

I am passing an argument to a file and i wanna check whether the argument is a number or string ?
how can i do this?

anbu23 · #2 (**permalink**) 02-21-2007

Code:

[[ -z $( echo $x | grep "^[0-9]*$" ) ]] || echo "number"

jim mcnamara · #3 (**permalink**) 02-21-2007

Code:

#/bin/ksh
a=$1
b=`echo $a| tr -dc  '[:digit:]' `
if [[ "$b" = "$a" ]] ; then
  echo "numbers only"
else
  echo "not numbers only"
fi

rolex.mp · #4 (**permalink**) 02-21-2007

thanks it works

matrixmadhan · #5 (**permalink**) 02-22-2007

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