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Hide the name of a process listed in the `ps` output
$ exec -a $NAME $COMMAND $ARGS `your_cmd -erase_all_files` is the real process, but harmless-looking getty appears in the process table. Never actually had a need to do this, but interesting nonetheless... Tested in bash, dash. $ -a $NAME "pass NAME as the zeroth argument to COMMAND", i.e. customise the name of the process (as commonly seen with `ps`)

In (any) vi, add a keystroke to format the current paragraph.
That goes into your $HOME/.exrc file. " Nice macro to reformat lines: map ^A !}fmt Note that the ^A has to be input by typing ^V^A.

Include a remote file (in vim)
Like vim scp://yourhost//your/file but in vim cmds.

coloured shell prompt
This coloured prompt will show: username in green, grey "@" sign, hostname in red, current directory in yellow, typed commands in green.

rsync + find
rsync from source to dest all between >30

guitar synthesizer in one line of C
outputs a f=220Hz guitar string sound (fifth string A) needs ALSA

E-mail a traditional Berkeley mbox to another recipient as individual e-mails.

Generate White Noise
This command will generate white noise through your speakers (assuming you have sound enabled). It's good for staying focused, privacy, coping with tinnitus, etc. I use it to test that the sound works.

Displays process tree of all running processes
G - uses VT100 line drawing a - shows command line arguments of process p - prints PID of process For other options, man pstree :)

Show the PATH, one directory per line
This is useful for examining the path.


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