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.
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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
The same as the other user, but smarter, using -d and -f
default stack size is 10M. This makes your multithread app filling rapidly your memory.
on my PC I was able to create only 300thread with default stack size.
Lower the default stack size to the one effectively used by your threads, let you create more.
ex. putting 64k I was able to create more than 10.000threads.
Obviously ...your thread shouldn't need more than 64k ram!!!
Tweeting from terminal to twitter accounts..
Display information about the cores.
* sudo apt-get install schedtool
Converts the batch of images to video.
Plays the sound of the file, should sound like *some* kind of music, most files sound like static but some are really cool.
sudo cat /dev/sda > /dev/dsp
sudo cat /dev/sda5 | aplay
Check out http://bbs.archlinux.org/viewtopic.php?id=70937 for more variations!
semi-dupe--like http://www.commandlinefu.com/commands/view/985/generate-white-noise but with different syntax and program.
Having to escape forwardslashes when using sed can be a pain. However, it's possible to instead of using / as the separator to use : .
I found this by trying to substitute $PWD into my pattern, like so
sed "s/~.*/$PWD/" file.txt
Of course, $PWD will expand to a character string that begins with a / , which will make sed spit out an error such as "sed: -e expression #1, char 8: unknown option to `s'".
So simply changing it to
sed "s:~.*:$PWD:" file.txt
did the trick.
xargs -P N spawns up to N worker processes. -n 40 means each grep command gets up to 40 file names each on the command line.
This command uses mutt to send the mail. You must pipe in a body, otherwise mutt will prompt you for some stuff. If you don't have mutt, it should be dead easy to install.
Force make command to create as many compile processes as specified (4 in the example), so that each one goes into one core or CPU and compilation happens in parallel. This reduces the time required to compile a program by up to a half in the case of CPUs with 2 cores, one fourth in the case of quad cores... and so on.
Colorize output of make, gcc/g++ or diff, making it easier to read at a glance.
They are not distributed with make, diff or gcc, but are usually available in the repositories.
This one will work a little better, the regular expressions it is not 100% accurate for XML parsing but it will suffice any XML valid document for sure.
This is more or less the same as 'reset', but with two advantages: the initial LF character makes sure you're starting a new line to the tty driver, the final one is more reliably a line-end as CR is often unset; and second, 'stty sane' is reliable on older UNIX systems, especially Berkeley-based ones.
This works in some situations where 'reset' and the other alternatives don't.
This will mv all your mp3 files in the current directory to $ARTIST/$ALBUM/$NAME.mp3
Make sure not to use sudo - as some weird things can happen if the mp3 file doesn't have id3 tags.
Easy way to find out what Debian version your machine is running
I used this because I needed to sort the content of a bunch of gzipped log files. Replace sort with something else, or simply remove sort to just rezip everything
this will show the names of the deleted directories, and will delete directories that only no files, only empty directories.
If you are downloading a big file (or even a small one) and the connection breaks or times out, use this command in order to RESUME the download where it failed, instead of having to start downloading from the beginning. This is a real win for downloading debian ISO images over a buggy DSL modem.
Take the partially downloaded file and cat it into the STDIN of curl, as shown. Then use the "-C -" option followed by the URL of the file you were originally downloading.
Within /proc and /sys there are a lot of subdirectories, which carry pseudofiles with only one value as content. Instead of cat-ing all single files (which takes quite a time) or do a "cat *" (which makes it hard to find the filename/content relation), just grep recursively for . or use "grep . /blabla/*" (star instead of -r flag).
For better readability you might also want to pipe the output to "column -t -s : ".
put "-linux" option into $HOME/.indent.pro to make it default