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:
Change your wallpaper every thirty minutes (or however long you like, I suppose) to a randomly selected image in a directory and subdirectories. Bear in mind this is not safe to use if anyone else has write access to your image directory.
Shows the UUID of a filesystem or partition that can be used in kernel root options and in fstab.
Run it without the -u option to generate more information. eg:
~/ sudo vol_id /dev/sda2
Simply changes the wallpaper of xfce4 from the command line. Not for multiple displays.
This works just like write or wall ... cept one thing the sender is anonymous ... if you really want to drive everyone insane replace echo \"The Matrix has you...\" with cat /dev/urandom
nice one to do on April fool's day
use today's time stamp to make a unique directory for today or an hour ago ...
If histappend options is set in bash, the file .bash_history will not be overwrite and history list is append to it.
Also with optional message:
echo "no login for you" > /etc/nologin
(This doesn't affect your current X session - you're already logged in!)
pinfo package provide a nice info alternative based on ncurses.
Works on CentOS ad OpenBSD too, display time of accounts connection on a system, -p option print individual user's statistics.
You can use this in a script which rotates wallpapers from a directory at each login.
Do you have an entire album in a unique file and want to split it in individual tracks? If you also have the cue file you can do it!
Packages for Debian-based systems users:
* cuetools shntool
* FLAC (.flac): flac
* WavPack (.wv): wavpack
* Monkey's Audio (.ape): libmac2 monkeys-audio (deb http://www.debian-multimedia.org sid main)
NOTE: "sid" packages are unstable, but I didn't have problems with them. If you prefer, use the "stable" version repository.
To transfer the tags, you can use this (works with .flac, .ogg and .mp3):
cuetag sample.cue split-track*.flac
The title is optional.
-t: expire time in milliseconds.
-u: urgency (low, normal, critical).
-i: icon path.
On Debian-based systems you may need to install the 'libnotify-bin' package.
Useful to advise when a wget download or a simulation ends. Example:
wget URL ; notify-send "Done"
txt2regex can be interactive or noninteractive and generates regular expressions for a variety of dialects based on user input. In interactive mode, the regex string builds as you select menu options. The sample output here is from noninteractive mode, try running it standalone and see for yourself. It's written in bash and is available as the 'txt2regex' package at least under debian/ubuntu.
You've opened a terminal window and you've connected off to a remote host that didn't pick up your terminal size, and all your curses and paging apps are screwed up as a result. You need to quickly determine how many lines are in your current terminal view (to feed into "stty rows X").
Useful for switching over someone else's coding style who uses camelCase notation to your style using all lowercase with underscores.
Clone linux installation.
Copy every file from current directory to destination preserving modification time.
From screen's manpage: "Attach here and now. In detail this means: If a session is running, then reattach. If necessary detach and logout remotely first. If it was not running create it and notify the user. This is the author's favorite."
Toss this in your ~/.bash_profile so that you never have that "oh crap" moment where you wanted to run something in screen and didn't.
GNU shred is provided by the coreutils package on most Linux distribution (meaning, you probably have it installed already), and is capable of wiping a device to DoD standards.
You can give shred any file to destroy, be it your shell history or a block device file (/dev/hdX, for IDE hard drive X, for example). Shred will overwrite the target 25 times by default, but 3 is enough to prevent most recovery, and 7 passes is enough for the US Department of Defense. Use the -n flag to specify the number of passes, and man shred for even more secure erasing fun.
Note that shredding your shell history may not be terribly effective on devices with journaling filesystems, RAID copies or snapshot copies, but if you're wiping a single disk, none of that is a concern. Also, it takes quite a while :)
Installing most OSX apps is just a matter of dropping it in /Applications, either GUI-wise or with cp -r. However, many packages are distributed in "mpkg" format, and those have to be installed with an installer. If you don't want to go to the trouble of firing up VNC to install an mpkg, you can use the "installer" command.
This will install an application from a .mpkg it to /Applications system-wide. To install a program for just one user, replace "-target /" with "-target username".