Shell Programming and Scripting

#!/usr/bin/ksh

cat test.txt | while read line
 do
        OP=`print $line | awk -F: '{ print $2 }' `
        case ${OP} in
                '<')
                         print $line | awk -F: '{ if ( $2 ~ /</ && $1 < $3 ) print ( $1,"less than",$3 ); else  print ( $1,"NOT less than",$3 )  }' 
                        ;;
                '>')
                         print $line | awk -F: '{ if ( $2 ~ />/ && $1 > $3 ) print ( $1,"greater than",$3 ); else  print ( $1,"NOT greater than",$3 ) }'
                        ;;
                '=')
                         print $line | awk -F: '{ if ( $2 ~ /=/ && $1 == $3 ) print ( $1,"equal to",$3 ); else  print ( $1,"NOT equal to",$3 ) }'
                        ;;
        esac
 done