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List all users and groups

check the filesystem and use a progress bar
if you happen to start with out the -C switch then you a killall -USR1 e2fsck

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"

Merge AVI-files without recoding
Useful for when you download movies split into < 700mb parts. Credit to rich @ http://superuser.com/questions/318640/merge-avi-files-without-recoding-in-mac-os-x-lion mencoder is generally included with mplayer. MacPorts: $sudo port install mplayer

Send a file to a pastebin from STDIN or a file, with a single function
echo "Hello world!" | sprunge # Redirect a stream to a pastebin sprunge ~/.bashrc # Send a file to a pastebin

Get your current Public IP

Remove comments from files
Use sed to remove comments from a file. In this example the comments begin with #. The command '/^#/d' remove line starting with #. The command 's/#.*$//' remove comments at end of lines.

attach to bash shell in the last container you started

Find the package that installed a command

List the most recent dates in reverse-chronological order


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