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compare two version notation strings in Bash
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#!/bin/bash | |
versionAccepted() { | |
### $1 is the minimum required version, $2 is the version in question; | |
### If $1 < $2, return 0 (the input version is accepted) | |
### otherwise, return 1 (not accepted) | |
versions=( "$1" "$2" ) | |
#printf "${versions[*]}\n" | |
for (( i=0; i<${#versions[@]}; ++i )); do | |
### Make it lowercases | |
local v=${versions[$i],,} | |
### Strip off quots; | |
### Most of cases, it is not necessary, but | |
### Some tools return quoted version strings and | |
### the quotes may be here without being removed by the shell; | |
[ "${v:0:1}" = "\"" ] && v=${v#\"} && v=${v%\"} | |
[ "${v:0:1}" = "\'" ] && v=${v#\'} && v=${v%\'} | |
### [ Extension point ] Add rules to suit your version naming convension; | |
### [ Discussion ] | |
### e.g., You might expect that 1.8.0-alpha3 < 1.8.0-beta2, | |
### but this will be 1.8.0-alpha3 > 1.8.0-beta2 | |
### unless you add a rule saying alpha comes before beta; | |
### ( Non-numerics will be ignored by default ) | |
### So add a new rule as follows to make alpha < beta work | |
### v=${v/alpha/0.}; v=${v/beta/1.} | |
### Likewise, to make 1.8.0_0-ea < 1.8.0_0 work | |
### ( 'ea' stands for 'early access'; JRE/JDK uses this naming conversion ) | |
### Add a rule as follows; | |
### v=${v/ea/}; v+=. | |
versions[$i]=${v} | |
done | |
#printf "${versions[*]}\n" | |
local lesserVersion=$( printf "%s\n%s" "${versions[0]}" "${versions[1]}" | tr -cs '0-9\n' '.' | sort -t . -k1,1 -k2,2 -k3,3 -k4,4 -k5,5 -k6,6 -k7,7 -k8,8 -k9,9 -g | head -1 ) | |
local minimumVersion=$( printf "%s" "${versions[0]}" | tr -cs '0-9' '.' ) | |
#printf "%s --- %s\n" "$minimumVersion" "$lesserVersion" | |
[ "$lesserVersion" = "$minimumVersion" ] | |
} | |
versionAccepted "$1" "$2" | |
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