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Build a shell script comparable version number

/ Published in: Bash
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A \"simple\" way to build a version number to compare in your shell scripts

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  1. #!/bin/sh
  2.  
  3. # put a version number "1.2.3.4" in the form "1 2 3 4"
  4. filter_version()
  5. {
  6.     echo $1 | sed 's/\./ /g'
  7. }
  8.  
  9. # reverse the order: "1 2 3 4" become "4 3 2 1"
  10. reverse_order()
  11. {
  12.     for n in $@
  13.     do
  14.         reverse="$n $reverse";
  15.     done
  16.  
  17.     echo $reverse
  18. }
  19.  
  20. # build an integer version number 
  21. build_version()
  22. {
  23.     multiplier=1
  24.     version=0;
  25.  
  26.     for i in $@
  27.     do
  28.         temp=$(( $multiplier * $i ))
  29.         version=$(( $version + $temp ))
  30.         multiplier=$(( $multiplier * 1000 ))
  31.     done
  32.  
  33.     echo $version
  34. }
  35.  
  36. # example
  37. VERSION="1.2.3.4"
  38. filtered=$(filter_version $VERSION)
  39. reversed=$(reverse_order $filtered)
  40.  
  41. build_version $reversed

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