[SOLVED] Increment last piece of a version number in bash and store in variable

Issue

Easy question, but i spent too much time to resolve it.

1 #!/bin/bash  
2 currentVersion="1.2.0"  
3 someVar=`$currentVersion | awk -F. '{$NF = $NF + 1;} 1' | sed 's/ /./g')`  
4 echo $currentVersion | awk -F. '{$NF = $NF + 1;} 1' | sed 's/ /./g')  

1, 2 and 4 lines works well. 4 line print 1.2.1 as needed.
I need to set this expression into someVar but nothing helped. Please tell how to do it in bash?

Solution

Using parameter expansion :

someVar="${currentVersion%.*}.$((${currentVersion##*.}+1))"

Answered By - Philippe