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

Watch the progress of 'dd'

Terminal - Watch the progress of 'dd'
dd if=/dev/urandom of=file.img bs=4KB& pid=$!
2009-04-08 05:56:47
User: atoponce
Functions: dd
9
Watch the progress of 'dd'

Running this code will execute dd in the background, and you'll grab the process ID with '$!' and assign it to the 'pid' variable. Now, you can watch the progress with the following:

while true; do kill -USR1 $pid && sleep 1 && clear; done

The important thing to grasp here isn't the filename or location of your input or output, or even the block size for that matter, but the fact that you can keep an eye on 'dd' as it's running to see where you are at during its execution.

Alternatives

There is 1 alternative - vote for the best!

Terminal - Alternatives
pv -tpreb /dev/urandom | dd of=file.img
2012-04-11 22:32:52
User: marrowsuck
Functions: dd
Tags: dd pv
8

This version was mentioned in the comments. Credits go to flatcap.

dd if=/dev/urandom of=file.img bs=4KB& pid=$!; while [[ -d /proc/$pid ]]; do kill -USR1 $pid && sleep 1 && clear; done
2011-06-24 21:49:10
Functions: dd kill sleep
Tags: dd progress
2

Only slightly different than previous commands. The benefit is that your "watch" should die when the dd command has completed. (Of course this would depend on /proc being available)

dd if=/dev/urandom of=file.img bs=4KB& sleep 1 && pid=`pidof dd`; while [[ -d /proc/$pid ]]; do kill -USR1 $pid && sleep 10 && clear; done
2012-02-23 01:45:53
Functions: dd kill sleep
1

The previously-posted one-liner didn't work for me for whatever reason, so I ended up doing this instead.

kill -SIGUSR1 xxxx
2012-04-12 09:32:24
User: netaxiz
Functions: kill
Tags: dd pv
1

run this in another terminal, were xxxx is the process ID of the running dd process.

the progress will report on the original terminal that you ran dd on

ctrl-t
2014-01-28 14:43:14
Tags: dd
1

Pressing ctrl-t will display the progress

Know a better way?

If you can do better, submit your command here.

What others think

Alternatively, if you have 'pv' installed:

pv /dev/urandom | dd of=file.img bs=4KB count=1234

This will display a progress bar for fixed-size input, or just a throughput speed for unlimited things like urandom.

Comment by flatcap 284 weeks and 1 day ago

dd if=/dev/urandom |cpipe -vt| dd of=file.img

Comment by oernii 284 weeks and 1 day ago

pv: http://ivarch.com/programs/pv.shtml

cpipe: http://cpipe.berlios.de/

(for the less observant) The trick here is that sending 'dd' the USR1 signal causes it to print the latest transfer statistics.

Comment by bwoodacre 284 weeks and 1 day ago

hey thx for reminding me to create alias of this

#ddp dd_args

function ddp() { dd "$@" & pid=$! && while true; do kill -USR1 $pid && sleep 1 && clear; done ;}
Comment by professoralex 279 weeks and 1 day ago

You could use

watch -n1 "kill -USR1 $pid"

instead of the sleep and clear in a for loop.

Comment by stuart 257 weeks ago

Well... i think oernii had it. I wouldn't call him less observant, but rather more. The kill -USR1 isn't needed, and pv does work. For example, copying a hdd

pv /dev/sda |dd of=/dev/sdb

Works perfectly

Comment by darkdragn 208 weeks and 6 days ago

Your point of view

You must be signed in to comment.

Related sites and podcasts