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check whether variable number or string

 
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# 1  
Old 02-21-2007
check whether variable number or string
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?
# 2  
Old 02-21-2007
Code:
[[ -z $( echo $x | grep "^[0-9]*$" ) ]] || echo "number"

# 3  
Old 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

# 4  
Old 02-21-2007
thanks it works
# 5  
Old 02-22-2007
Had been answered many times, take a look at this Smilie
 
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