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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Upgrade pip-installed python packages

Squish repeated delimiters into one
This can be particularly useful used in conjunction with a following cut command like $echo "hello::::there" | tr -s ':' | cut -d':' -f2 which prints 'there'. Much easier that guessing at -f values for cut. I know 'tr -s' is used in lots of commands here already but I just figured out the -s flag and thought it deserved to be highlighted :)

Matrix Style
Solves "tr" issues with non C-locales under BSD-like systems (like OS X)

HourGlass
Displays an animated hourglass for x amount of seconds

Count all conections estabilished on gateway

Windows telnet
Check if TCP port is reacheable

Set laptop display brightness
Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

List your MACs address
The output of ifconfig is localized, using it will fail in non-English environment. "ip" command in iproute2 provides a consistent output and thus is more robust

Add to Instapaper
Adds URL to Instapaper. Usage: instapaper-add user@example.com 12345 http://www.commandlinefu.com/

reverse order of file
awk reverse order of lines (emulates "tac")


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