version compare for bash

vcompare

#!/bin/bash

# compare version $1 and $2; returns 0 if version $1 >= $2
# versions must be numeric only
vcompare() {
  local v1=$1 v2=$2 v1a v2a n1 n2 max i
  IFS=. read -ra v1a <<< "$v1"; IFS=. read -ra v2a <<< "$v2"
  ((n1=${#v1a[@]}, n2=${#v2a[@]}, max=(n1 > n2 ? n1 : n2)))
  for ((i=0; i<max; ++i))
  do
    ((v1a[i] == v2a[i])) && continue
    ((v1a[i] > v2a[i]))
    return
  done
}

vcompare() {
  local v1=$1 v2=$2 v1a v2a n1 n2 max i
  IFS=. read -ra v1a <<< "$v1"
  IFS=. read -ra v2a <<< "$v2"
  for ((n1=${#v1a[@]},
        n2=${#v2a[@]},
        max=(n1 > n2 ? n1 : n2),
        i=0
      ; i<max && v1a[i] == v2a[i]
      ; ++i)) do : ; done
  ((v1a[i] >= v2a[i]))
}