Commands using xargs

checking files in current and sub directories, finding out the files containing "sampleString" and removing the containing lines from the file.

* Beware that The command will update the original file [no backup].

The command can be extended if play with 'find' command together,

e.g. it is possible to execute on certain type of files: *.xml, *.txt... (find -name "*.xml" | grep....)

if anybody knows a better solution on that, please drop a comment. thx.

Counts number of lines of code in *.h and *.cc files

Create a tgz archive of all the files containing local changes relative to a subversion repository.

Add the '-q' option to only include files under version control:

Useful if you are not able to commit yet but want to create a quick backup of your work. Of course if you find yourself needing this it's probably a sign you should be using a branch, patches or distributed version control (git, mercurial, etc..)

This script first find all files which contains word xxxxx recursively. Then replace the word xxxxx to yyyyy of the files.

Use case:

- Web site domain change

- Function name change of the program

Seq allows you to define printf like formating by specified with -f, %03g is actually tells seq I got three digits, fill the blank digits with 0, and the range is from 176 to 240.

syntax follows regular command line expression.

example: let's say you have a directory (with subdirs) that has say 4000 .php files.

All of these files were made via script, but uh-oh, there was a typo!

if the typo is "let's go jome!" but you meant it to say "let's go home!"

find . -name "*.php" | xargs perl -pi -e "s/let\'s\ go\ jome\!/let\'s\ go\ home\!/g"

all better :)

multiline: find . -name "*.php" | xargs perl -p0777i -e 's/knownline1\nknownline2/replaced/m'

indescriminate line replace: find ./ -name '*.php' | xargs perl -pi -e 's/\".*$\"/\new\ line\ content/g'

Greps IRC logs for phrases and lists users who said them.

Probably posted previously, I use this all the time to find and kill a process for "APP". Simply replace "APP" with the name of the process you're looking to kill.

Kill all processes with foo in them. Similar to pkill but more complete and also works when there is no pkill command.

Works on almost every Linux/Unix platform I have tried.

Variant of find grep that ignores files with .svn in the name. Useful for searching through a local repository of source code.

checks which files are not under version control, fetches the names and runs them through "svn add". WARNING: doesn't work with white spaces.

Using xargs is better than:

as the -exec switch uses a separate process for each remove. xargs splits the streamed files into more managable subsets so less processes are required.

Creates a command alias ('cr' in the above example) that searches the contents of files matching a set of file extensions (C & C++ source-code in the above example) recursively within the current directory. Search configured to be in colour, ignore-case, show line numbers and show 4 lines of context. Put in shell initialisation file of your choice. Trivially easy to use, e.g:

Searches all .php files for a static instantiation of a class and displays the class names along with their frequencies.