Posts Tagged version

Shell Script Version Compare (vercmp)

Posted by A R Baboon in Uncategorized on April 5, 2010

Here is something useful. A very short shell script to compare standard version numbers of the form ##.##.## with up to four segments. It returns the difference of the first differing segment just like strcmp.

#!/bin/sh
 
expr '(' "$1" : '\([^.]*\)' ')' '-' '(' "$2" : '\([^.]*\)' ')' '|' \
    '(' "$1.0" : '[^.]*[.]\([^.]*\)' ')' '-' '(' "$2.0" : '[^.]*[.]\([^.]*\)' ')' '|' \
    '(' "$1.0.0" : '[^.]*[.][^.]*[.]\([^.]*\)' ')' '-' '(' "$2.0.0" : '[^.]*[.][^.]*[.]\([^.]*\)' ')' '|' \
    '(' "$1.0.0.0" : '[^.]*[.][^.]*[.][^.]*[.]\([^.]*\)' ')' '-' '(' "$2.0.0.0" : '[^.]*[.][^.]*[.][^.]*[.]\([^.]*\)' ')'

Update: Added zeros to deal with unbalanced version compares

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