Commands by Cowboy (13)

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Prepend a text to a file.
Using the sed -i (inline), you can replace the beginning of the first line of a file without redirecting the output to a temporary location.

Quick and Temporary Named Commands
* Add comment with # in your command * Later you can search that command on that comment with CTRL+R In the title command, you could search it later by invoking the command search tool by first typing CTRL+R and then typing "revert"

Remove all mail in Postfix mail queue.

Backup all databases in a MySQL container

Search commandlinefu.com from the command line using the API
Usage: cmdfu hello world

Show a config file without comments
Shows a file without comments (at least those starting by #) - removes empty lines - removes lines starting by # or "some spaces/tabs then #'" Useful when you want to quickly see what you have to customize on a freshly installed application without reading the comments that sometimes are a full 1000 lines documentation :) While posting, I saw this http://www.commandlinefu.com/commands/view/1041/display-contents-of-a-file-wo-any-comments-or-blank-lines But it's dirty and incomplete, to my mind My original goal was to remove lines like "\t*#" but I can't figure out how to do a egrep '\t' on a command-line. Two workarounds if needed: $egrep -v 'press control + V then TAB then #' /your/file or $egrep -v -f some_file /your/file #where some_file contains what you want to exclude, example a really inserted TAB

list block devices
Shows all block devices in a tree with descruptions of what they are.

Record audio and video from webcam using ffmpeg
Record from a webcam, audio using ALSA encoded as MP3, video as MPEG-4.

Backup all MySQL Databases to individual files
No need to loop when we have `xargs`. The sed command filters out the first line of `show databases` output, which is always "Database".

Create a simple playlist sort by Genre using mp3info


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