Hide

What's this?

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/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

OpenID

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Hide

Stay in the loop…

Follow the Tweets.

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.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

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:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands tagged shuf

Hide

News

2011-03-12 - Confoo 2011 presentation: Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands: To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner: Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed: Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.

Hide

Functions

Hide

Credits

Site by David Winterbottom (user root).

Commands tagged shuf

Terminal - Commands tagged shuf - 10 results

echo $(cat /usr/share/dict/words |grep -v "'"|shuf -n4)

2011-08-31 12:48:14

User: d1v3rdown

Functions: cat echo grep

Tags: cat echo grep shuf

Up
Down

Generate an XKCD #936 style 4 word passphrase (fast) w/o apostrophes

Fast and excludes words with apostrophes. For ubuntu, you can use wamerican or wbritish dictionaries, installable through aptitude.

cat /usr/share/dict/words | grep -P ^[a-z].* | grep -v "'s$" | grep -Pv ^.\{1,15\}$ | shuf -n4 | tr '\n' ' ' | sed 's/$/\n/'

2011-08-15 01:03:48

User: bugmenot

Functions: cat grep sed tr

Tags: tr xkcd shuf

-2

Up
Down

Generate an XKCD #936 style 4 word password

The first grep rejects capitalised words since the dict has proper nouns in it that you mightn't want to use. The second grep rejects words with ending in apostrophe s, and the third forces the words to be at least 15 characters long.

shuf -n4 /usr/share/dict/words | sed -e ':a;N;$!ba;s/\n/ /g;s/'\''//g;s/\b$.$/\u\1/g;s/ //g'

2011-08-11 19:49:21

User: vasti

Functions: sed

Tags: sed regex xkcd shuf

Up
Down

Alternative way to generate an XKCD #936 style 4 word password usig sed

This is what I came up to generate XKCD #936 style four-word password.

Since first letter of every word is capitalized it looks a bit more readable to my eyes.

Also strips single quotes.

And yes - regex is a bit of a kludge, but that's the bes i could think of.

shuf -n4 /usr/share/dict/words | tr -d '\n'

2011-08-10 13:04:39

User: Strawp

Functions: tr

Tags: tr xkcd shuf

Up
Down

Generate an XKCD #936 style 4 word password

4 random words are better than one obfuscated word

http://xkcd.com/936/

for i in {21..79};do echo -e "\x$i";done | tr " " "\n" | shuf | tr -d "\n"

2011-04-14 01:43:40

User: hunterm

Functions: echo tr

Tags: echo password tr for shuf for loop generator alpha symbols digit

-4

Up
Down

Random Password Generator (uses all chars, no repeated chars)

Generates a password using symbols, alpha, and digits. No repeating chars.

seq -w 50 | sort -R | head -6 |fmt|tr " " "-"

2011-01-05 01:12:58

User: metalx1000

Functions: head seq sort tr

Tags: random range shuf

Up
Down

lotto generator

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

shuf -i 1-49 -n 6 | sort -n | xargs

2011-01-05 00:07:46

User: niall

Functions: sort

Tags: random range shuf

Up
Down

lotto generator

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

sort -R SOMEFILE

2010-09-16 22:29:27

User: miniker84

Functions: sort

Tags: sort sorting random shuf

Up
Down

Randomize lines in a file

Works in sort (GNU coreutils) 7.4, don't know when it was implemented but sometime the last 6 years.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

shuf SOMEFILE

2010-09-16 12:45:28

User: dooblem

Tags: random shuf

Up
Down

Randomize lines in a file

shuf is in the coreutils package

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

man $(ls -1 /usr/share/man/man?/ | shuf -n1 | cut -d. -f1)

2010-08-20 23:36:10

User: dooblem

Functions: cut ls man

Tags: man sort shuf

-3

Up
Down

Display a random man page

Another one.

Maybe not the quicker because of the sort command, but it will also look in other man sections.

updated with goodevilgenius 'shuf' idea

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate