man xkill

A very interesting man page!

There weren't any one liners for ettercap on this site... tisk tisk :-) (of course you'll have to plugin your own values for the variables..)

Contrary to logic, typing calendar won't show a calendar, that's the job of cal. Typing calendar will show some trivia related to the current date. Tested against many Linux distros and FreeBSD. Show Sample Output

This function takes a word or a phrase as arguments and then fetches definitions using Google's "define" syntax. The "nl" and perl portion isn't strictly necessary. It just makes the output a bit more readable, but this also works: define(){ local y="$@";curl -sA"Opera" "http://www.google.com/search?q=define:${y// /+}"|grep -Po '(?<=<li>)[^<]+';} If your version of grep doesn't have perl compatible regex support, then you can use this version: define(){ local y="$@";curl -sA"Opera" "http://www.google.com/search?q=define:${y// /+}"|grep -Eo '<li>[^<]+'|sed 's/<li>//g'|nl|perl -MHTML::Entities -pe 'decode_entities($_)' 2>/dev/null;} Show Sample Output

Takes two input video files and an external audio track and encodes them together to an MPEG-4 DivX output video file with the correct size ready for uploading.

HP UX doesn't have a -a switch in the ifconfig command. This line emulates the same result shown in Solaris, AIX or Linux Show Sample Output

An easter-egg from emacs. Show Sample Output

Comment out all lines in a file with "somestring" in the beginning. Sed -i is used for in place edits. Useful if you need to comment out lines beginning with somestring

The loop is to compare cookies. You can remove it... Maybe you wanna use curl... curl www.commandlinefu.com/index.php -s0 -I | grep "Set-Cookie"

If a directory name contains space xargs will do the wrong thing. Parallel https://savannah.nongnu.org/projects/parallel/ deals better with that. Show Sample Output

This deals nicely with files having special characters in the file name (space ' or "). Parallel is from https://savannah.nongnu.org/projects/parallel/

xargs deals badly with special characters (such as space, ' and "). To see the problem try this: touch important_file touch 'not important_file' ls not* | xargs rm Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.

The difference between this and the other alternatives here using only grep is that find will, by default, not follow a symlink. In some cases, this is definitely desirable. Using find also allows you to exclude certain files, eg find directory/ ! -name "*.tmp" -exec grep -ni phrase {} + would allow you to exclude any files .tmp files. Also note that there's no need for calling grep recursively, as find passes each found file to grep.

xargs deals badly with special characters (such as space, ' and "). In this case if you have a file called '12" record'. Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem. Both solutions work bad if the number of files is more than the allowed line length of the shell.

With the force options the same results can be achieved Show Sample Output

This version makes uses of Bash shell expansion, so it might not work in all other shells.

Improvement of the command "Find Duplicate Files (based on size first, then MD5 hash)" when searching for duplicate files in a directory containing a subversion working copy. This way the (multiple dupicates) in the meta-information directories are ignored. Can easily be adopted for other VCS as well. For CVS i.e. change ".svn" into ".csv": find -type d -name ".csv" -prune -o -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type d -name ".csv" -prune -o -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate Show Sample Output

xargs deals badly with special characters (such as space, ' and "). To see the problem try this: touch important_file touch 'not important_file' ls not* | xargs rm Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.

xargs deals badly with special characters (such as space, ' and "). To see the problem try this: touch important_file touch 'not important_file' ls not* | xargs rm Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.

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/