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.

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

Hide

Credits

Commands by pdxdoughnut from sorted by
Terminal - Commands by pdxdoughnut - 21 results
mv -iv $FILENAME{,.$(stat -c %y $FILENAME | awk '{print $1}')}
2014-12-01 22:41:38
User: pdxdoughnut
Functions: awk mv stat
Tags: mv
3

Note that the -i will not help in a script. Proper error checking is required.

echo "I am $BASH_SUBSHELL levels nested";
diff -qr /dirA /dirB
find ./ -type l -ls
ls | xargs WHATEVER_COMMAND
2014-03-12 18:00:21
User: pdxdoughnut
Functions: ls xargs
-4

xargs will automatically determine how namy args are too many and only pass a reasonable number of them at a time. In the example, 500,002 file names were split across 26 instantiations of the command "echo".

killall conky
nmap -sn 192.168.1.0/24
find . -name "pattern" -type f -printf "%s\n" | awk '{total += $1} END {print total}'
2014-01-16 01:16:18
User: pdxdoughnut
Functions: awk find
2

Using find's internal stat to get the file size is about 50 times faster than using -exec stat.

mkdir Epub ; mv -v --target-directory=Epub $(fgrep -lr epub *)
CMD=chrome ; ps h -o pmem -C $CMD | awk '{sum+=$1} END {print sum}'
mussh -h 192.168.100.{1..50} -m -t 10 -c uptime
2013-11-27 18:01:12
User: pdxdoughnut
Tags: ssh uptime mussh
1

This will run them at the same time and timeout for each host in ten seconds. Also, mussh will append the ip addres to the beginning of the output so you know which host resonded with which time.

The use of the sequence expression {1..50} is not specific to mussh. The `seq ...` works, but is less efficient.

du -Sh | sort -h | tail
2013-11-27 17:50:11
User: pdxdoughnut
Functions: du sort
1

I added -S to du so that you don't include /foo/bar/baz.iso in /foo, and change sorts -n to -h so that it can properly sort the human readable sizes.

base64 /dev/urandom | head -c 33554432 | split -b 8192 -da 4 - dummy.
9

Avoiding a for loop brought this time down to less than 3 seconds on my old machine. And just to be clear, 33554432 = 8192 * 4086.

sudo lsof -iTCP:25 -sTCP:LISTEN
for i in {1..4096}; do base64 /dev/urandom | head -c 8192 > dummy$i.rnd ; done
1

Using the 'time' command, running this with 'tr' took 28 seconds (and change) each time but using base64 only took 8 seconds (and change). If the file doesn't have to be viewable, pulling straight from urandom with head only took 6 seconds (and change)

find -name .git -prune -o -type f -exec md5sum {} \; | sort -k2 | md5sum
logger -t MyProgramName "Whatever you're logging"
find garbage/ -type f -delete
2013-10-21 23:26:51
User: pdxdoughnut
Functions: find
-1

I _think_ you were trying to delete files whether or not they had spaces. This would do that. You should probably be more specific though.

lsof -iTCP:8080 -sTCP:LISTEN
find -size +100M
for IP in $(/sbin/ifconfig | fgrep addr: | sed 's/.*addr:\([[0-9.]*\) .*/\1/') ; do host $IP | awk '{print $5}'; done