Commands tagged xargs

Grabs the Apache config file (yielded from httpd) and returns the path specified as DocumentRoot.

For instance:

will encode all .wav files into FLAC in parallel.

Explanation of xargs flags:

-P [max-procs]: Max number of invocations to run at once. Set to 0 to run all at once [potentially dangerous re: excessive RAM usage].

-n [max-args]: Max number of arguments from the list to send to each invocation.

-0: Stdin is a null-terminated list.

I use xargs to build parallel-processing frameworks into my scripts like the one here: http://pastebin.com/1GvcifYa

If your version of curl does not support the --compressed option, use

instead of

see http://www.imagemagick.org/Usage/color_mods/#modulate

This example command fetches 'example.com' webpage and then fetches+saves all PDF files listed (linked to) on that webpage.

[*Note: of course there are no PDFs on example.com. This is just an example]

rename file name with fixed length nomeric format pattern

The result of this command is a tar with all files that have been modified/added since revision 1792 until HEAD. This command is super useful for incremental releases.

for when find . -print | grep -v .svn | xargs doesnt cut it.

Deletes capistrano-style release directories (except that there are dashes between the YYYY-MM-DD)

One of my friends committed his code in the encoding of GB2312, which broke the build job. I have to find his code and convert.

If you have the fdupes command, you'll save a lot of typing. It can do recursive searches (-r,-R) and it allows you to interactively select which of the duplicate files found you wish to keep or delete.

Take a folder full of files and split it into smaller folders containing a maximum number of files. In this case, 100 files per directory.

find creates the list of files

xargs breaks up the list into groups of 100

for each group, create a directory and copy in the files

Note: This command won't work if there is whitespace in the filenames (but then again, neither do the alternative commands :-)

same as

Uses xargs to call the second grep with the first grep's results as arguments

recursively search dir for a a particular file type, search each file for a particular text.

If you want to pull all of the files from a tree that has mixed files and directories containing files, this will link them all into a single directory. Beware of filesystem files-per-directory limits.

unset PROMPT_COMMAND to disable.

Increase the modification date for the files selected with the find command.

Grabs the cmdline used to execute the process, and the environment that the process is being run under. This is much different than the 'env' command, which only lists the environment for the shell. This is very useful (to me at least) to debug various processes on my server. For example, this lets me see the environment that my apache, mysqld, bind, and other server processes have.

Here's a function I use:

From my .bash_profile at http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html