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

Commands tagged clock from sorted by
Terminal - Commands tagged clock - 12 results
date -u `ssh user@remotehost date -u '+%m%d%H%M%Y.%S'`
2014-02-10 03:11:14
User: scruss
Functions: date
0

Useful if localhost is a small machine running BusyBox, which uses a slightly unusual format to set the date. Remotehost can be pretty much any Linux machine, including one running BusyBox. Uses UTC for portability.

while(true); do printf "%s\f" $(date +%T); sleep 1; done | sm -
2013-01-14 17:13:34
User: claudius
Functions: date printf sleep
Tags: time clock sm
1

http://www.joachim-breitner.de/projects#screen-message now also supports reading stdin continuously to update what it shows, different ?slides? separated by a form feed character. Here, we feed the current time into it each second to create a large clock.

sleep $((3600 - ($(date +%s) % 3600) ))
2012-12-09 16:21:57
User: Mozai
Functions: date sleep
2

pauses exactly long enough to wake at the top of the hour

while [[ 1 ]] ; do clear; banner `date +%H:%M:%S` ; sleep 1; done
2011-03-24 16:41:09
User: lkj
Functions: banner sleep
Tags: bash clock
3

Turn your terminal into digital clock.

echo 'hardstatus alwayslastline " %d-%m-%y %c:%s | %w"' >> $HOME/.screenrc; screen
2011-02-16 08:04:56
User: olorin
Functions: echo
4

Configures screen to always display the clock in the last line (has to be configured only once).

After that you not only have got the possibility to detach sessions and run them in background, but also have got a nice clock permanently on your screen.

yes 'clear;printf "`date`\n" | figlet -f starwars | boxes;sleep 1' | sh
2011-02-16 03:58:19
User: lkjoel
Functions: printf sleep yes
0

This is a different version from my original command: Console clock -- Beautiful (http://www.commandlinefu.com/commands/view/7902/console-clock-beautiful )

This one uses Boxes and Figlet.

To install the dependencies on Ubuntu, type in:

sudo apt-get install boxes figlet

To install the dependencies on Debian, type in:

aptitude install boxes figlet
yes 'clear;printf "\n\n`date`\n" | figlet -f starwars;sleep 1' | sh
2011-02-16 03:05:52
User: lkjoel
Functions: printf sleep yes
1

This will show a console clock with Figlet.

This is with the Star Wars font.

Change the -f option to anything else.

Notice: You need Figlet installed for this to work.

To install Figlet on Ubuntu, type in:

sudo apt-get install figlet

To install Figlet on Debian, type in:

aptitude install figlet
watch -t -n1 'date "+%r %F %A"'
2011-02-16 03:05:48
User: oracular
Functions: watch
Tags: date clock watch
5

Shows a simple clock in the console

-t param removes the watch header

Ctrl-c to exit

yes 'clear;printf "\n\n\n\n\t\t\t`date`\n";sleep 1' | sh
2011-02-16 02:57:16
User: lkjoel
Functions: printf sleep yes
2

This command will automatically clear the old clock time, and show the new clock time.

It will also slightly format it.

watch -n 1 'date "+obase=2; print %H,\":\",%M,\":\",%S" |bc'
2011-02-02 00:01:48
User: smax
Functions: watch
6

Binary clock with separate H:M:S.

watch -n 1 'echo "obase=2;`date +%s`" | bc'
ntpdate pool.ntp.org && hwclock --systohc && hwclock --adjust
2009-06-04 13:35:14
User: Weboide
Functions: hwclock
Tags: time sync ntp clock
5

Do not run this command if you already have ntpd running!

This needs to run as root, for example with sudo:

sudo ntpdate pool.ntp.org && sudo hwclock --systohc && sudo hwclock --adjust

This command will fetch accurate time from NTP servers and synchronize your system clock, then it will use the system clock to synchronize your hardware clock, and will calculate the time drift.