commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
Subscribe to the feed for:
A powerfull way to rename file using sed groups.
& stand for the matched expression.
\1 referes to the first group between parenthesis. \2 to the second.
Start screen in detached mode, i.e., already running on background. The command is optional, but what is the purpose on start a blank screen process that way?
It's useful when invoking from a script (I manage to run many wget downloads in parallel, for example).
Sometimes Firefox crashes or is bad finished and the message the process is still running appear while it's not. This also works when you sharing account from a NIS server and try to open the browser on multiple computers.
Use the lshw command to display information about your video card. Give more ouput when run as root.
Purge all configuration files of removed packages
A short way to give us relevant report in a moment done about quantities on disk usage, memory and swap in our Linux Systems.
typing history it's a long way but typing only h it's my way it works in whatever distro or OSes or shells that you use, you know, only for easyness :)
Useful for removes a package and its depends, for example to remove the gnome desktop environment, also configuration files will be removed, you should be carefully and sure that you want to do this.
Displays only the VGA adapter/chipset being used for the graphics. In this case, it gave me the "M22" and "Mobility Radeon x300" that I needed to research a graphics issue I was having.
This is useful if you have need to do port forwarding and your router doesn't assign static IPs, you can add it to a script in a cron job that checks if you IP as recently changed or with a trigger script.
This was tested on Mac OSX.
Use date to find the date at other days and times.
This command list and sort files by size and in reverse order, the reverse order is very helpful when you have a very long list and wish to have the biggest files at the bottom so you don't have scrool up.
The file size info is in human readable output, so ex. 1K..234M...3G
Tested with Linux (Red Hat Enterprise Edition)
Written for linux, the real example is how to produce ascii text graphs based on a numeric value (anything where uniq -c is useful is a good candidate).
If you're a moron like me, sometimes your fingers get away from you and you, for example, enter your password when you're already authenticated to ssh-agent, sudo, etc., and your password ends up in shell history. Here's how to get it out.
url can be a working copy or url to a svn repository, revision is any valid revision number for that branch.
It requires inkscape 0.46 and lxml packages
gps data from geocaching.com is provided for free in .loc format.
Certain codecs in high res don't play so well on my Dell Mini 9. Using this command, I can play just about anything and it keeps the sound in sync to boot!
Highlights the search pattern in red.
Also works with files:
To decrypt use the -d option:
echo SGVsbG8gd29ybGQK | base64 -d
A script that checks if your environment is correctly configured for using cobbler.
Add a repo to cobbler. To download all the repository contents the command is:
Lam is a command available on Bsd (I've tested it on OpenBSD).Is useful for laminate a file line by line. The -f option set the field width ( -f min.max ).