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.

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

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

Tags

Hide

Functions

Get the IP of the host your coming from when logged in remotely

Terminal - Get the IP of the host your coming from when logged in remotely
echo ${SSH_CLIENT%% *}
2011-01-11 10:58:35
User: bashrc
Functions: echo
28
Get the IP of the host your coming from when logged in remotely

Even faster without the need for cut... :)

Alternatives

There are 7 alternatives - vote for the best!

Terminal - Alternatives
echo $SSH_CLIENT | cut -f 1 -d ' '
2011-01-11 10:20:45
User: infinull
Functions: cut echo
0
host -i `echo $SSH_CLIENT | cut -f 1 -d \ ` | sed 's/.* domain name pointer \(.*\)\./\1/'

to reverse lookup and get the hostname.

Know a better way?

If you can do better, submit your command here.

What others think

What is going on here with the

%% *

?

Comment by asphaltleopard 81 weeks and 2 days ago

It's a bash string operation that removes a suffix. In this case everything (*) following the first space in the variable $SSH_CLIENT - which looks like: "192.168.178.1 45721 22". So what is left is the ip.

From "man bash":

{parameter%%word} Remove matching suffix pattern.
Comment by bashrc 79 weeks ago

Your point of view

You must be signed in to comment.

Related sites and podcasts