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Simulate typing but with mistakes
The output will show jerk, then wonderful person since echo parses the \b character.

Empty the linux buffer cache

Run command in an ftp session
By putting ! in front of a command, we are able to run it from an ftp session.

How to run X without any graphics hardware
This starts an X server using Xvfb(1) (no graphics hardware required), then starts a VNC server on the display. Change :1 if there's a conflict with an existing display, and change 800x600x24 to suit your tastes (24 is the bit depth, 800x600 is the size). This command obviously requires X be installed, and also x11vnc(1); both are available via your favourite package manager. You can also use another VNC server of your choosing, as long as DISPLAY is set to the display of Xvfb(1). To change your desktop environment (the default is twm(1), which is rather fail), you can add it to your ~/.xinitrc file (see the startx(1) manpage for details).

Watch the progress of 'dd'
This version was mentioned in the comments. Credits go to flatcap.

bulk rename files with sed, one-liner
Renames all files in a directory named foo to bar. foobar1 gets renamed to barbar1 barfoo2 gets renamed to barbar2 fooobarfoo gets renamed to barobarfoo NOTE: Will break for files with spaces AND new lines AND for an empty expansion of the glob '*'

Screensaver
Console screensaver.

check open ports without netstat or lsof

Search commandlinefu from the CLI
html2text: http://www.mbayer.de/html2text/

Two command output
Summarize established connections after netstat output. Using tee and /dev/stderr you can send one command output to terminal before executing wc so you can summarize at the bottom of the output.


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