All commands

Get the first 10 google results form a querry, but showing only the urls from the results.

Use + to search diferent terms, ex: commandlinefu+google .

works only in zsh

Errors in output don't matter. Stop recording: ctrl-c. Result playable with Flash too.

IMPORTANT: Find a Pulse Audio device to capture from: pactl list | grep -A2 'Source #' | grep 'Name: ' | cut -d" " -f2

useful if you are using lots of data URI's in your css files

Write 200 blocks of 512k to a dummy file with dd, timing the result. The is useful as a quick test to compare the performance of different file systems.

To get all directories, replace pattern*/ by just */

If you vim a compressed file it will list all archive content, then you can pickup any of them for editing and saving. There you have the modified archive without any extra step. It supports many file types such as tar.gz, tgz, zip, etc.

This command will bypass checking the host key of the target server against the local known_hosts file.

When you SSH to a server whose host key does not match the one stored in your local machine's known_hosts file, you'll get a error like " WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!" that indicates a key mismatch. If you know the key has legitimately changed (like the server was reinstalled), a permanent solution is to remove the stored key for that server in known_hosts.

However, there are some occasions where you may not want to make the permanent change. For example, you've done some port-forwarding trickery with ssh -R or ssh -L, and are doing ssh user@localhost to connect over the port-forwarding to some other machine (not actually your localhost). Since this is usually temporary, you probably don't want to change the known_hosts file. This command is useful for those situations.

Credit: Command found at http://linuxcommando.blogspot.com/2008/10/how-to-disable-ssh-host-key-checking.html. Further discussion of how it works is there also.

Note this is a bit different than command #5307 - with that one you will still be prompted to store the unrecognized key, whereas this one won't prompt you for the key at all.

Change n directories up, without parameters change one up

Remove all zero size files from current directory. Its a not recursive option like:

find . -size 0c -exec rm {} \;

I used to use the Firefox "View page info" feature a lot to determine how stale the web page I was looking at was. Now that I use mostly Chrome I miss that feature, so here is a command line alternative using wget. The -S says to display the server response, the --spider says to not download any files/pages, just fetch the header. The output goes to stderr, so to grep it you use 2>&1 to combine the stderr stream with stdout, the pipe that to grep for Last-Modified.

You can use curl instead if you have it installed, like this:

This will extract all the apt-get install commands issued on the box, even if they are in the gzipped history files.

dd can be used with /dev/zero to easily create a file of all zero-bytes. Pipe that through tr and use octal conversions to change the byte values from zero to 0xff (octal 0377). You can replace 0377 with the byte of your choice. You can also use \\0 and \\377 instead of the quoted version.

A simple way to rename a set of files to a unique, randomized file name.

Outputs the number of different pixels.

2 params to increase tolerance:

* thumbnails size

* fuzz, the color distance tolerance

See http://en.positon.org/post/Compare-/-diff-between-two-images for more details.

run it inside a screen session, you send commands to screen itself!

This is like `cd -` but doesn't echo the new directory name, which is preferable (to me) for an alias, e.g.

This lets you replace a file or directory and quickly revert if something goes wrong. For example, the current version of a website's files are in public_html. Put a new version of the site in public_html~ and execute the command. The names are swapped. If anything goes wrong, execute it again (up arrow or !!).

Returns last day of current month. Useful to implement a bash script backup based on a GFS strategy.

Put this in your bash startup script so you can quickly remember the top rated commands on CommandLineFu's website. Put it in .bashrc on Linux, or .bash_profile on OSX.

When you 'ps|grep' for a given process, it turns out that grep itself appears as a valid line since it contains the RE/name you are looking for. To avoid grep from showing itself, simply insert some wildcard into process' name.

find the PIDs for all the process which include myprog.