Split string on last desired character in bash-CodePudding

I have a file named like this: my-file-1.2.0.jar

I want to extract the version of this file by splitting on the last -. Hence I would have the following output: 1.2.0.jar

I would also like to get rid of the .jar if it's possible with the same command to have this output: 1.2.0

How can I achieve that with bash ?

CodePudding user response：

Use parameter expansion:

#! /bin/bash
filename=my-file-1.2.0.jar
version=${filename##*-}
version=${version%.jar}
echo "$version"

## removes the largest matching pattern from the left. % removes the shortest matching pattern from the right (but .jar contains no wildcards, so using %% for the longest match would work equally well).

CodePudding user response：

Here is way to do this in single step using extglob:

shopt -s extglob
s='my-file-1.2.0.jar'
echo "${s// (.jar|*-)}"

1.2.0