bash_n_examples/bash/version/version_test.sh

   1 #grub-version checking
   2 version_test_numeric()
   3 {
   4   local retval ta tb
   5   #extract version number
   6   local a="$(echo $1 | cut -d - -f 2- | sed 's/-.*//')."
   7   local b="$(echo $2 | cut -d - -f 2- | sed 's/-.*//')."
   8   if [ "$a" = "$b" ] ; then
   9     return 0
  10   fi
  11   numpass=1
  12   while true; do
  13     [ -z "$(echo $a | cut -d . -f $numpass)" ] && ta="$a 0" || ta="$a $(echo $a | cut -d . -f $numpass)"
  14     [ -z "$(echo $b | cut -d . -f $numpass)" ] && tb="$b 0" || tb="$b $(echo $b | cut -d . -f $numpass)"
  15     [ "$(echo $ta | cut -d " " -f 2)" = "$(echo $tb | cut -d " " -f 2)" ] || break
  16     numpass=$(expr $numpass + 1)
  17   done
  18   if (echo $ta ; echo $tb) | sort -n -k 2 | cut -d " " -f 1 | head -n 1 | grep -qx $b ; then
  19     return 0
  20   else
  21     return 1
  22   fi
  23 }
  24 version_test_alphabetic()
  25 {
  26   #extract kernel version
  27   local a=`echo $1 | cut -d - -f 2-`
  28   local b=`echo $2 | cut -d - -f 2-`
  29   if [ "$a" = "$b" ] ; then
  30     return 0
  31   fi
  32   if (echo $a ; echo $b) | sort | head -n 1 | grep -qx $b ; then
  33     return 0
  34   else
  35     return 1
  36   fi
  37 }
  38 version_find_latest()
  39 {
  40   local n=$#
  41   local a=$(eval 'echo $'$n)
  42   for i in $@ ; do
  43     if version_test_numeric "$i" "$a" ; then
  44       a="$i"
  45     fi
  46   done
  47   echo "$a"
  48 }
  49
  50 version_find_latest pkg-2.6.34.9-lt pkg-2.5.34.9-lt pkg-2.8.12.9-lt pkg-1.6.34.9 pkg-3.0 pkg-3.0f pkg-3.0e