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#! /bin/sh
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# vim:et:ft=sh:sts=2:sw=2
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#
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# Versions determines the versions of all installed shells.
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#
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# Copyright 2008-2020 Kate Ward. All Rights Reserved.
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# Released under the Apache 2.0 License.
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#
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# Author: kate.ward@forestent.com (Kate Ward)
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# https://github.com/kward/shlib
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#
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# This library provides reusable functions that determine actual names and
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# versions of installed shells and the OS. The library can also be run as a
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# script if set executable.
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#
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# Disable checks that aren't fully portable (POSIX != portable).
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# shellcheck disable=SC2006
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ARGV0=`basename "$0"`
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LSB_RELEASE='/etc/lsb-release'
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VERSIONS_SHELLS='ash /bin/bash /bin/dash /bin/ksh /bin/mksh /bin/pdksh /bin/zsh /usr/xpg4/bin/sh /bin/sh /sbin/sh'
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true; TRUE=$?
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false; FALSE=$?
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ERROR=2
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UNAME_R=`uname -r`
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UNAME_S=`uname -s`
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__versions_haveStrings=${ERROR}
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versions_osName() {
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os_name_='unrecognized'
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os_system_=${UNAME_S}
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os_release_=${UNAME_R}
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case ${os_system_} in
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CYGWIN_NT-*) os_name_='Cygwin' ;;
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Darwin)
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os_name_=`/usr/bin/sw_vers -productName`
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os_version_=`versions_osVersion`
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case ${os_version_} in
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10.4|10.4.[0-9]*) os_name_='Mac OS X Tiger' ;;
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10.5|10.5.[0-9]*) os_name_='Mac OS X Leopard' ;;
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10.6|10.6.[0-9]*) os_name_='Mac OS X Snow Leopard' ;;
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10.7|10.7.[0-9]*) os_name_='Mac OS X Lion' ;;
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10.8|10.8.[0-9]*) os_name_='Mac OS X Mountain Lion' ;;
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10.9|10.9.[0-9]*) os_name_='Mac OS X Mavericks' ;;
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10.10|10.10.[0-9]*) os_name_='Mac OS X Yosemite' ;;
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10.11|10.11.[0-9]*) os_name_='Mac OS X El Capitan' ;;
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10.12|10.12.[0-9]*) os_name_='macOS Sierra' ;;
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10.13|10.13.[0-9]*) os_name_='macOS High Sierra' ;;
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10.14|10.14.[0-9]*) os_name_='macOS Mojave' ;;
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10.15|10.15.[0-9]*) os_name_='macOS Catalina' ;;
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11.*) os_name_='macOS Big Sur' ;;
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12.*) os_name_='macOS Monterey' ;;
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*) os_name_='macOS' ;;
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esac
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;;
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FreeBSD) os_name_='FreeBSD' ;;
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Linux) os_name_='Linux' ;;
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SunOS)
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os_name_='SunOS'
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if [ -r '/etc/release' ]; then
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if grep 'OpenSolaris' /etc/release >/dev/null; then
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os_name_='OpenSolaris'
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else
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os_name_='Solaris'
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fi
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fi
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;;
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esac
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echo ${os_name_}
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unset os_name_ os_system_ os_release_ os_version_
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}
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versions_osVersion() {
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os_version_='unrecognized'
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os_system_=${UNAME_S}
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os_release_=${UNAME_R}
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case ${os_system_} in
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CYGWIN_NT-*)
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os_version_=`expr "${os_release_}" : '\([0-9]*\.[0-9]\.[0-9]*\).*'`
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;;
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Darwin)
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os_version_=`/usr/bin/sw_vers -productVersion`
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;;
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FreeBSD)
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os_version_=`expr "${os_release_}" : '\([0-9]*\.[0-9]*\)-.*'`
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;;
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Linux)
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if [ -r '/etc/os-release' ]; then
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os_version_=`awk -F= '$1~/PRETTY_NAME/{print $2}' /etc/os-release \
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|sed 's/"//g'`
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elif [ -r '/etc/redhat-release' ]; then
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os_version_=`cat /etc/redhat-release`
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elif [ -r '/etc/SuSE-release' ]; then
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os_version_=`head -n 1 /etc/SuSE-release`
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elif [ -r "${LSB_RELEASE}" ]; then
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if grep -q 'DISTRIB_ID=Ubuntu' "${LSB_RELEASE}"; then
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# shellcheck disable=SC2002
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os_version_=`cat "${LSB_RELEASE}" \
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|awk -F= '$1~/DISTRIB_DESCRIPTION/{print $2}' \
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|sed 's/"//g;s/ /-/g'`
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fi
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fi
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;;
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SunOS)
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if [ -r '/etc/release' ]; then
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if grep 'OpenSolaris' /etc/release >/dev/null; then # OpenSolaris
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os_version_=`grep 'OpenSolaris' /etc/release |awk '{print $2"("$3")"}'`
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else # Solaris
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major_=`echo "${os_release_}" |sed 's/[0-9]*\.\([0-9]*\)/\1/'`
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minor_=`grep Solaris /etc/release |sed 's/[^u]*\(u[0-9]*\).*/\1/'`
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os_version_="${major_}${minor_}"
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fi
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fi
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;;
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esac
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echo "${os_version_}"
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unset os_release_ os_system_ os_version_ major_ minor_
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}
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versions_shellVersion() {
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shell_=$1
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shell_present_=${FALSE}
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case "${shell_}" in
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ash) [ -x '/bin/busybox' ] && shell_present_=${TRUE} ;;
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*) [ -x "${shell_}" ] && shell_present_=${TRUE} ;;
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esac
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if [ ${shell_present_} -eq ${FALSE} ]; then
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echo 'not installed'
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return ${FALSE}
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fi
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version_=''
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case ${shell_} in
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# SunOS shells.
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/sbin/sh) ;;
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/usr/xpg4/bin/sh) version_=`versions_shell_xpg4 "${shell_}"` ;;
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# Generic shell.
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*/sh)
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# This could be one of any number of shells. Try until one fits.
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version_=''
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[ -z "${version_}" ] && version_=`versions_shell_bash "${shell_}"`
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# dash cannot be self determined yet
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[ -z "${version_}" ] && version_=`versions_shell_ksh "${shell_}"`
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# pdksh is covered in versions_shell_ksh()
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[ -z "${version_}" ] && version_=`versions_shell_xpg4 "${shell_}"`
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[ -z "${version_}" ] && version_=`versions_shell_zsh "${shell_}"`
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;;
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# Specific shells.
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ash) version_=`versions_shell_ash "${shell_}"` ;;
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# bash - Bourne Again SHell (https://www.gnu.org/software/bash/)
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*/bash) version_=`versions_shell_bash "${shell_}"` ;;
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*/dash) version_=`versions_shell_dash` ;;
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# ksh - KornShell (http://www.kornshell.com/)
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*/ksh) version_=`versions_shell_ksh "${shell_}"` ;;
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# mksh - MirBSD Korn Shell (http://www.mirbsd.org/mksh.htm)
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*/mksh) version_=`versions_shell_ksh "${shell_}"` ;;
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# pdksh - Public Domain Korn Shell (http://web.cs.mun.ca/~michael/pdksh/)
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*/pdksh) version_=`versions_shell_pdksh "${shell_}"` ;;
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# zsh (https://www.zsh.org/)
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*/zsh) version_=`versions_shell_zsh "${shell_}"` ;;
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# Unrecognized shell.
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*) version_='invalid'
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esac
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echo "${version_:-unknown}"
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unset shell_ version_
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}
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# The ash shell is included in BusyBox.
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versions_shell_ash() {
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busybox --help |head -1 |sed 's/BusyBox v\([0-9.]*\) .*/\1/'
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}
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versions_shell_bash() {
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$1 --version : 2>&1 |grep 'GNU bash' |sed 's/.*version \([^ ]*\).*/\1/'
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}
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# Assuming Ubuntu Linux until somebody comes up with a better test. The
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# following test will return an empty string if dash is not installed.
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versions_shell_dash() {
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eval dpkg >/dev/null 2>&1
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[ $? -eq 127 ] && return # Return if dpkg not found.
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dpkg -l |grep ' dash ' |awk '{print $3}'
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}
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versions_shell_ksh() {
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versions_shell_=$1
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versions_version_=''
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# Try a few different ways to figure out the version.
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versions_version_=`${versions_shell_} --version : 2>&1`
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# shellcheck disable=SC2181
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if [ $? -eq 0 ]; then
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versions_version_=`echo "${versions_version_}" \
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|sed 's/.*\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\).*/\1/'`
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else
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versions_version_=''
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fi
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if [ -z "${versions_version_}" ]; then
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# shellcheck disable=SC2016
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versions_version_=`${versions_shell_} -c 'echo ${KSH_VERSION}'`
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fi
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if [ -z "${versions_version_}" ]; then
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_versions_have_strings
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versions_version_=`strings "${versions_shell_}" 2>&1 \
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|grep Version \
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|sed 's/^.*Version \(.*\)$/\1/;s/ s+ \$$//;s/ /-/g'`
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fi
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if [ -z "${versions_version_}" ]; then
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versions_version_=`versions_shell_pdksh "${versions_shell_}"`
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fi
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echo "${versions_version_}"
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unset versions_shell_ versions_version_
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}
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# mksh - MirBSD Korn Shell (http://www.mirbsd.org/mksh.htm)
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# mksh is a successor to pdksh (Public Domain Korn Shell).
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versions_shell_mksh() {
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versions_shell_ksh
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}
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# pdksh - Public Domain Korn Shell
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# pdksh is an obsolete shell, which was replaced by mksh (among others).
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versions_shell_pdksh() {
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_versions_have_strings
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strings "$1" 2>&1 \
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|grep 'PD KSH' \
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|sed -e 's/.*PD KSH \(.*\)/\1/;s/ /-/g'
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}
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versions_shell_xpg4() {
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_versions_have_strings
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strings "$1" 2>&1 \
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|grep 'Version' \
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|sed -e 's/^@(#)Version //'
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}
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versions_shell_zsh() {
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versions_shell_=$1
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# Try a few different ways to figure out the version.
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# shellcheck disable=SC2016
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versions_version_=`echo 'echo ${ZSH_VERSION}' |${versions_shell_}`
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if [ -z "${versions_version_}" ]; then
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versions_version_=`${versions_shell_} --version : 2>&1`
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# shellcheck disable=SC2181
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if [ $? -eq 0 ]; then
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versions_version_=`echo "${versions_version_}" |awk '{print $2}'`
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else
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versions_version_=''
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fi
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fi
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echo "${versions_version_}"
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unset versions_shell_ versions_version_
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}
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# Determine if the 'strings' binary installed.
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_versions_have_strings() {
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[ ${__versions_haveStrings} -ne ${ERROR} ] && return
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if eval strings /dev/null >/dev/null 2>&1; then
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__versions_haveStrings=${TRUE}
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return
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fi
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echo 'WARN: strings not installed. try installing binutils?' >&2
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__versions_haveStrings=${FALSE}
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}
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versions_main() {
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# Treat unset variables as an error.
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set -u
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os_name=`versions_osName`
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os_version=`versions_osVersion`
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echo "os: ${os_name} version: ${os_version}"
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for shell in ${VERSIONS_SHELLS}; do
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shell_version=`versions_shellVersion "${shell}"`
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echo "shell: ${shell} version: ${shell_version}"
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done
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}
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if [ "${ARGV0}" = 'versions' ]; then
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versions_main "$@"
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fi
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