Question : need last three characters of the  string

I need last three chaarcters of string .  I have series of of file names

somefilename1.xyz112
somefilename2.abc121
...

I need to get last three characters(112 or 121  or 131 etc  which are version numbers which I reuse later)
thanks in advance

Answer : need last three characters of the  string

Sorry.. You misplaced the brackets and $ from my original comment.. If you do so, it won't work.

1: 2:

export version=`echo $file_name | sed 's/.*\(...\)$/\1/'` echo $version