Extract version number from file in shell script

Question

$ v=1.2.13
$ echo "${v%.*}.$((${v##*.}+1))"
1.2.14

$ v=11.1.2.3.0
$ echo "${v%.*}.$((${v##*.}+1))"
11.1.2.3.1

Here is how it works:

The string is split in two parts.

the first one contains everything but the last dot and next characters: ${v%.*}
the second one contains everything but all characters up to the last dot: ${v##*.}

The first part is printed as is, followed by a plain dot and the last part incremented using shell arithmetic expansion: $((x+1))