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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.
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Site by David Winterbottom (user root).

Do I have this command?

Terminal - Do I have this command?
which <command> > /dev/null 2>&1 && echo Success!
2013-03-13 10:04:42
User: skkzsh
Functions: echo which
-4
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Do I have this command?

or

which <command> > /dev/null 2>&1 || echo Error!

For example, I write

which colordiff > /dev/null 2>&1 && alias diff=colordiff

in my `~/.bashrc`.

Add to favourites | Report as malicious

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

Perhaps more useful, is to use "type ".

For example:

which ls

/bin/ls

type ls

ls is aliased to `ls -F --color=auto'

Comment by mpb 9 weeks and 4 days ago

Thank you, but outputs of `which` and `type` on my environments are different from yours.

For example:

which ls

ls: aliased to ls -Fh

type ls

ls is an alias for ls -Fh

on Debian GNU/Linux 6.0 & Mac OS X 10.7.5.

I always use `which` since its output is simple.

Comment by skkzsh 9 weeks and 4 days ago

zsh:

(( $+commands[colordiff] )) && echo "success"

BTW, if you want both 'which' and 'type' you can provide which with the '--read-alias' switch, that is if your not using the builtin:

% which which

which='alias |/usr/bin/which --tty-only --read-alias --show-dot --show-tilde'

/usr/bin/which

Comment by khayyam 8 weeks and 3 days ago

Your point of view

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