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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Undo commit in Mercurial

cooking a list of numbers for calculation
When you've got a list of numbers each on its row, the ECHO command puts them on a simple line, separated by space. You can then substitute the spaces with an operator. Finally, pipe it to the BC program.

Dock Thunderbird in system tray and hide main window
Dock Thunderbird in system tray and hide main window. Very useful for startup scripts. Of course you can dock any app of your choice.

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Find the package that installed a command

Detach a process from the current shell
Continue to execute the command in background even though quitting the shell.

scan multiple log subdirectories for the latest log files and tail them

silent/shh - shorthand to make commands really quiet
Sometimes I just want to run a command quietly but all that keyboard shifting makes my fingers hurt. This little function does the job eg.: $ if shh type less; then PAGER=less; fi

Add forgotten changes to the last git commit
It's pretty common to forgot to commit a files, be it a modification, or a brand new file. If you did forget something, git add the files you want, and then git commit --amend. It will essentially redo the last commit, with the changes you just added. It seeds the commit message with the last commit message by default. You probably shouldn't do this if you've already pushed the commit.


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