Commands using sort (800)

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List all the files that have been deleted while they were still open.
If your customer deletes a file that is still in use by a process, that space does not get freed up (will not show up in df) until that process either closes the file on its own, or is killed.

Get HTTP status code with curl

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"

Get backup from remote host, then expand in current directory using tar

remove lines which are longer than 255

Replace Caps-lock with Control-key
You can return to defaults with "setxkbmap". More here: http://dailycli.blogspot.com/2009/12/xmodmap-replace-caps-lock-with-left.html

oneliner to transfer a directory using ssh and tar
this will tar/send/untrar a whole directory.

backup system over ssh, exlucde common dirs

drop first column of output by piping to this

Stoppable sleep
A nice way to interrupt a sleep with a signal.


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