xdg-open FILE - opens a file with the default GUI app. I use it for example to open PDFs and PNG. I have a one letter alias for that. It can also open a file explorer in the current directory xdg-open . . Should work on any compliant desktop environment (gnome/kde).

cd - undoes the last cd. Not quite push/popd but still useful. Pro tip, works also: git checkout -

In my bubble, MSN was the first messenger used by non-nerds. For me it was the third messenger after IRC and ICQ that i really used. Nerds were on IRC, Gamers on ICQ