version_lt.sh

#!/bin/bash
# Usage:
#
#     git push origin $(git tag | version_lt 1.7.0 | xargs -I{} echo :{})
# 
#     version_lt 1.6.0 1.7.0
split()
{
    # Prefix local names with the function name to try to avoid conflicts
    # local split_wordlist
    split_wordlist="$1"
    shift
    read "$@" <<EOF-split-end-of-arguments
${split_wordlist}
EOF-split-end-of-arguments
}

test_version_lt()
{
    version_ge_v1=$1
    version_ge_v2=$2
    version_ge_v1=${version_ge_v1/-[a-z]*/}
    version_ge_v2=${version_ge_v2/-[a-z]*/}
    version_ge_save_ifs="$IFS"
    while test -n "${version_ge_v1}${version_ge_v2}"; do
        IFS="."
        split "$version_ge_v1" version_ge_a version_ge_v1
        split "$version_ge_v2" version_ge_b version_ge_v2
        IFS="$version_ge_save_ifs"
        #echo " compare  $version_ge_a  $version_ge_b"
        test "0$version_ge_a" -lt "0$version_ge_b" && echo $1 # v1<v2:false
    done
}


if [[ -n $1 && -n $2 ]] ; then
    test_version_lt $1 $2
else
    while read source_version ; do
        test_version_lt $source_version $1
    done
fi