How to find version of a software installed in ubuntu
You can use dpkg to get that info:
dpkg -l mysql-server | grep -E "^ii" | tr -s ' ' | cut -d' ' -f3This will give you the installed version of the mysql-server package.
If a package is not installed, it will print out "No packages found matching mysql-server." instead.
Almost all programs that can be run in the command line have a --version option.
For example:
git --versionls --versionThe format of their output is nowhere near standard though. Some make it easier to parse, some (often) include a little information about the license.