This can be useful for transforming command-line args into input for xargs (one per line). This can also be done with ls if the args are filenames, but that's getting awfully close to Useless Use of Cat territory (http://partmaps.org/era/unix/award.html).

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: aa_ps_all () { ( cd /proc && command ps -A -opid= | xargs -I'{}' sh -c 'test $PPID -ne {}&&test -r {}/cmdline&&echo -e "\n[{}]"&&tr -s "\000" " "<{}/cmdline&&echo&&tr -s "\000\033" "\nE"<{}/environ|sort&&cat {}/limits' ); } From my .bash_profile at http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html Show Sample Output

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

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

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

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]

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

Written for Mac OSX. When you are working in a project and want to open it on Github.com, just type "gh" and your default browser will open with the repo you are in. Works for submodules, and repo's that you don't own. You'll need to copy / paste this command into a gh.sh file, then create an alias in your bash or zsh profile to the gh.sh script. Detailed instructions here if you still need help: http://gist.github.com/1917716

first grep all href images then sed the url part then wget

Sorts by latest modified files by looking to current directory and all subdirectories Show Sample Output

Use GNU Parallel: short, easy to read, and will run one job per core.

bash brace expansion, sequence expression Show Sample Output

Neither of the others worked for me. This does.

this is good for variables if you have many script created files and if you want to know which one is the last created/changed one..

First the find command finds all files in your current directory (.). This is piped to xargs to be able to run the next shell pipeline in parallel. The xargs -P argument specifies how many processes you want to run in parallel, you can set this higher than your core count as the duration reading is mainly IO bound. The -print0 and -0 arguments of find and xargs respectively are used to easily handle files with spaces or other special characters. A subshell is executed by xargs to have a shell pipeline for each file that is found by find. This pipeline extracts the duration and converts it to a format easily parsed by awk. ffmpeg reads the file and prints a lot of information about it, grep extracts the duration line. cut and sed cut out the time information, and tr converts the last . to a : to make it easier to split by awk. awk is a specialized programming language for use in shell scripts. Here we use it to split the time elements in 4 variables and add them up. Show Sample Output

Nice command to create a list, you can create too with for command, but this is so faster. Show Sample Output

A bit shorter and parallelized. Depending on the speed of your cpu and your disk this may run faster. Parallel is from https://savannah.nongnu.org/projects/parallel/

Warning!, if the pattern didn't find anything it shows the total size of dot dir Show Sample Output

Gnu grep allows to restrict the search to files only matching a given pattern. It also allows to exclude files.

recursive find and replace. important stuff are grep -Z and zargs -0 which add zero byte after file name so sed can work even with file names with spaces.

same as grep -lL "foo" $(grep -l bar *cl*.log)