Shell Programming and Scripting

#!/bin/ksh or bash or
# example numbers, remove numbers
otherchars=$(echo "$input" | tr -d "[0-9]")
[ "$otherchars" != "" ] && echo not ok $input && exit 1 # not num
# or using builtin properties - more speed less cpu
# replace numbers with nothing, rest of chars are something else
otherchars="${input//[0-9]/}"
[ "$otherchars" != "" ] && exit 1 # not num

#!/bin/ksh or bash or ...
check()
{
        case "$1" in
                ?(+|-|)+([0-9])) echo "int" ; return 1 ;;
                ?(+|-|)+([0-9])(,|.)+([0-9])) echo "not int, but it's numeric" ; return 2 ;;
                *) echo "something else" ; return 0 ;;
        esac
}
for i in 12 +12 -12 12+ 1.2 +1.2 -12.22 -12.2.22 2.3.4 A1 1A 2A.45 23,45 
do
        echo  -n "$i :"
        check $i
done