commandlinefu.com is the place to record those command-line gems that you return to again and again.
Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.
If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/
You can sign-in using OpenID credentials, or register a traditional username and password.
First-time OpenID users will be automatically assigned a username which can be changed after signing in.
Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
Subscribe to the feed for:
If the HISTTIMEFORMAT is set, the time stamp information associated with each history entry is written to the history file, marked with the history comment character.
This command is used to verify a sha256sum-formatted file hash list on IBM AIX or any other UNIX-like OS that has openssl but doesn't have sha256sum by default. Steps:
1: Save to the filesystem a script that:
A: Receives as arguments the two parts of one line of a sha256sum listing
B: Feeds a file into openssl on SHA256 standard input hash calculation mode, and saves the result
C: Compares the calculated hash against the one received as argument
D: Outputs the result in a sha256sum-like format
2: Make the script runnable
3: Feed the sha256sum listing to xargs, running the aforementioned script and passing 2 arguments at a time
This command is for producing GNU sha256sum-compatible hashes on UNIX systems that don't have sha256sum but do have OpenSSL, such as stock IBM AIX.
1.- Saves a wrapper script for UNIX find that does the following:
A.- Feeds a file to openssl on SHA256 hash calculation mode
B.- Echoes the output followed by the filename
2.- Makes the file executable
3.- Runs find on a directory, only processing files, and running on each one the wrapper script that calculates SHA256 hashes
Pending is figuring out how to verify a sha256sum file on a similar environment.
Use it to send raw data to a networked device. Used to interact with relay controller board whose documentation is lost, so use wireshark to sniff the sent data and replayed using the command.
Use dots to cd down directories instead of having to remember all of the pesky back slashes!
Better yet, works on even and odd number of dots! Now, just estimate how far down you want to traverse.
url can be like any one of followings:
If url mismatching, whole url will be returned.
Should work with sh, bash, etc.
printTextInColorRed foo bar
foo bar [in red color]
The input images are assume to have the "JPG" extension. Mogrify will overwrite any gif images with the same name! Will not work with names with spaces.
If you want avoid to be annoyed when playing your favourite video files with your video player, first run this command to stash wrong files (and test tricks to play these wrong files).
Remove the "echo" to actually archive.
Many similar commands are found on commandlinefu but I end up needing this very specific one from time to time.
To extract any of them, use the standard tar.bz2 extract command:
tar xvjf folder1.tar.bz2
This will find all the -Xmx[BIGINT] running on a system, add them up for you and give you the total.
Support several arguments.
Usage: ytmp3 "YTurl" "YTurl2" "YTurl3" "YTurlN"
Uses the shift command to let you extract the .mp3 from as many youtube urls as you like (or wherever else youtube-dl is supported)
Orginal chunk of code:
youtube-dl -q -t --extract-audio --audio-format mp3 URL
Set variable 'input' to a set of flac files.
Usage: google "[search string]"
Example: google "something im searching for"
This will launch firefox and execute a google search in a new tab with the provided search string.
You must provide the path to your Firefox binary if using cygwin to $ff or create an alias like follows:
alias firefox='/cygdrive/c/Program Files (x86)/Mozilla Firefox/firefox.exe'
Most Linux flavors with Firefox installed will use just ff="firefox" and even OSX.
Quickly remove the conflicting line (key) from current users known_hosts file when there is an SSH host conflict. Very nice when you get tired of writing out full commands. Ideally you would place this into your .bash_profile
Usage: rhost [n]
Example: rhost 33 (removes line 33 from ~/.ssh/known_hosts)
Function assumes the $HOME exists, you could alternatively use "~/.ssh/known_hosts"
Mac OSX likes a space for sed -i "$1" d
Automatically drops mount points that have non-numeric sizes (e.g. /proc). Tested in bash on Linux and AIX.
basic find implementation for systems that don't actually have find, like an android console without busybox installed.
The expression $(( $RANDOM * 6 / 32767 + 1 )) generates a random number between 1 and 6, which is then inserted into the escape sequence \e[3_m to switch the foreground color of the terminal to either red, green, yellow, blue, purple or cyan.
The color can be reset using the escape sequence \e[0m.
The full list of colors can be found here: https://wiki.archlinux.org/index.php/Color_Bash_Prompt#List_of_colors_for_prompt_and_Bash
This command takes all CR2 files in the current directory and convert them into JPG