Shell Programming and Scripting

#!/bin/sh

for vi in "$@"
do
    if [ "`echo $vi | sed 's/^[0-9]*$//'`" != "" ]; then
        echo "ERROR: invalid parameter: "$vi;
    fi
done

a="$*"
if [[ ${#a} -eq $(expr "$a" : '[0-9 ]*') ]] ; then
        echo numbers
else
        echo non-number
fi

for arg in "$@"
do
   if [[ "$arg" = +([0-9]) ]]
   then
      echo "Valid parameter <$arg>"
   else
      echo "Invalid parameter <$arg>"
   fi
done

#!/bin/tcsh

set a = "$*"
if ( `expr "$a" : '.*'` == `expr "$a" : '[0-9 ]*'` ) then
    echo numbers
else
    echo non-number
endif