#!/bin/bash

check_version_info() {
    local mode="" result="" fmt="%-20s %s %-20s\n"
    local ver1 expected ver2 mode=${1:-rpm}
    local errors=0
    while read ver1 expected ver2; do
        [ -n "$ver1" ] || continue
        result=""
        if [ "$mode" = "rpm" ]; then
            out=$(rpmdev-vercmp "$ver1" "$ver2")
            ret=$?
            case "$ret" in
                0) result="=";;
                11) result="<";;
                12) result=">";;
                *) result="?";;
            esac
        else
            {
            for t in "gt:>" "eq:=" "lt:<"; do
                op="${t%:*}"; ret="${t#*:}"
                if dpkg --compare-versions "$ver1" "$op" "$ver2"; then
                    result=$ret
                    break
                fi
            done
            } 
            [ -z "$result" ] && result="?"
        fi
        yikes=""
        if [ "$expected" != "$result" ]; then
            errors=$(($errors+1));
            yikes="!"
        fi
        printf "$fmt" "${yikes}$ver1" "$result" "$ver2"
    done
}

file=${1:-"-"}
mode="$2"
if [ -z "$mode" ]; then
   command -v dpkg >/dev/null && mode="dpkg" || mode="rpm"
   echo "#mode=$mode"
fi

if [ "$file" = "-" ]; then
    check_version_info "$mode"
else
    check_version_info <"$file"
fi