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.


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

Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Greets the user appropriately

Terminal - Greets the user appropriately
echo Good $(i=`date | cut -d: -f1 | cut -d' ' -f4-4` ; if [ $i -lt 12 ] ; then echo morning ; else if [ $i -lt 15 ] ; then echo afternoon ; else echo evening ; fi ; fi)
2010-09-21 11:16:36
User: foolcraft
Functions: cut echo
0
Greets the user appropriately

Get the hour and greet the user!

Make sure you add this to your bashrc, for a pleasant hacking experience!

Alternatives

There is 1 alternative - vote for the best!

Terminal - Alternatives
echo "12 morning\n15 afternoon\n24 evening" |while read t g; do if [ `date +%H` -lt $t ]; then echo "Good $g"; break; fi; done
echo Good $(i=`date +%H` ; if [ $i -lt 12 ] ; then echo morning ; else if [ $i -lt 15 ] ; then echo afternoon ; else echo evening ; fi ; fi)
2010-09-23 09:50:13
User: jyro
Functions: echo
Tags: date
0

Saves all the "cut" hacks

echo -e "12 morning\n15 afternoon\n24 evening" |awk '{if ('`date +%H`'<$1) {print "Good "$2;exit}}'
echo -e "12 morning\n15 afternoon\n24 evening" | awk '{if ('`date +%H`' < $1) print "Good " $2}'

Know a better way?

If you can do better, submit your command here.

What others think

It's better to use i=`date +%H`. No need for cut. There's also elif instead of "else if".

Comment by inof 309 weeks ago

Does the date output depend on the environ?

Comment by kaedenn 308 weeks and 5 days ago

@kaedenn: Yes, in general, see LC_TIME (setlocale) and the strftime manual pages. But %H is independent of the locale; it always expands to the hours as a two-digits number using a 24-hours clock (this is straight from the tm_hour element of a struct tm in C, see ). This is specified by the C90 and SUS/POSIX standards.

Comment by inof 308 weeks ago

Sorry, the web page accidentally removed the angle brackets ... I wrote "struct tm in C, see [time.h])" with angle brackets instead of square brackets.

Comment by inof 308 weeks ago

Your point of view

You must be signed in to comment.