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 snipertyler from sorted by
Terminal - Commands by snipertyler - 19 results
syt() { pipe=`mktemp -u`; mkfifo -m 600 "$pipe" && for i in "$@"; do youtube-dl -qo "$pipe" "$i" & mplayer "$pipe" || break; done; rm -f "$pipe"; }
2015-03-14 01:48:20
User: snipertyler
Functions: mkfifo rm
3

Streams youtube-dl video to mplayer.

Usage:

syt 'youtube.com/link' 'anotherlinkto.video'

Uses mplayer controls

ssh hostname nc -l 9876
if [ "${SSH_CLIENT%% *}" == "ipaddr" ]; then command; fi
2015-01-13 22:09:38
User: snipertyler
Tags: ssh
4

Place in ~/.bashrc

If you login to a ssh server from different ips, sometimes you want to do something specific for each.

e.g., quickly go into screen -x session from a phone, but not your desktop.

<ctrl>+o
2014-12-28 22:00:15
User: snipertyler
7

Similar to entering a command, but will not erase the command from the command line.

Basically a shortcut from entering command, then pushing the up arrow key.

cd -P .
mkfifo /tmp/view; nc -l 9876 < /tmp/view& script -f /tmp/view
2014-06-23 05:06:13
User: snipertyler
Functions: mkfifo script
Tags: Network nc fifo
4

connect to it with any network command (including web browser - if you don't mind weird formatting)

curl 127.0.0.1:9876

nc 127.0.0.1 9876

curl 'LINK' | pdftotext - - | less
2014-06-21 00:47:02
User: snipertyler
Tags: less pdf convert
4

Probably will not work very well with scanned documents.

ncat -vlm 5 --ssl --chat 9876
2014-06-07 19:17:29
User: snipertyler
14

Client ~$ ncat --ssl localhost 9876

Change localhost to the correct ip address.

stat -c '%n %U:%G-%a' *
2014-05-03 04:56:23
User: snipertyler
Functions: stat
Tags: permissions
3

#Alias

alias perm="stat -c '%n %U:%G-%a'"

#Function

perm() { for ll in $@; do stat -c "%n %U:%G-%a" "$ll"; done; }

ffmpeg -i file.ext -acodec copy -vn out.ext
2014-04-25 14:24:57
User: snipertyler
Tags: ffmpeg
3

This removes the video and subsequent file size and directly copies the audio.

tar -cf - file1 dir1/ dir2/ | md5sum
2014-04-17 14:33:44
User: snipertyler
Functions: tar
-3

Doesn't create a file

Make sure to list the files / directories in the same order every time.

curl 'AudioStream' | ffmpeg -i - -acodec libvorbis file.ogg
2014-03-31 02:07:20
User: snipertyler
0

This encodes it in ogg format.

Does on-the-fly encoding of the incoming stream.

Great for radio streams as they're often flv format.

edrv() { N=${1:-edrv}; truncate -s ${2:-256m} $N.img && L=$(losetup -f) && losetup $L $N.img && cryptsetup luksFormat --batch-mode $L && cryptsetup luksOpen $L $N && mkfs.vfat /dev/mapper/$N -n $N; cryptsetup luksClose $N; echo losetup -d $L to unmount; }
2014-02-24 01:38:21
User: snipertyler
Functions: echo losetup
2

You need to be root to do this. So check the command before running it.

You enter the same password for

Enter LUKS passphrase:

Verify passphrase:

Enter passphrase for /dev/loopn:

___

You can then copy the .img file to somewhere else.

Loop it it with losetup -f IMAGENAME.img and then mount it with a file manager (eg nemo) or run mount /dev/loopn /media/mountfolder

Acts similar to a mounted flash drive

ram() { mt=/mnt/ram && grep "$mt" < /proc/mts > /dev/null; if [ $? -eq 0 ] ; then read -p"Enter to Remove Ram Partition ";sudo umount "$mt" && echo $mt 0; else sudo mt -t tmpfs tmpfs "$mt" -o size=$(( ${1:-1} * 1024 ))m && echo $mt '-' "${1:-1}"gb; fi; }
2013-12-13 05:22:02
User: snipertyler
Functions: echo grep mt read sudo umount
Tags: sudo ram tmpfs
3

Creates a temporary ram partition

To use:

ram 3

to make a 3gb partition (Defaults to 1gb)

nc HOST PORT | tee movie.mp4 | mplayer -
2013-11-28 01:38:29
User: snipertyler
Functions: tee
7

Requires a listening port on HOST

eg. "cat movie.mp4 | nc -l 1356 " (cat movie.mp4 | nc -l PORT)

Useful if you're impatient and want to watch a movie immediately and download it at the same time without using extra bandwidth.

You can't seek (it'll crash and kill the stream) but you can pause it.

t2s() { wget -q -U Mozilla -O $(tr ' ' _ <<< "$1"| cut -b 1-15).mp3 "http://translate.google.com/translate_tts?ie=UTF-8&tl=en&q=$(tr ' ' + <<< "$1")"; }
2013-10-16 23:29:59
User: snipertyler
Functions: cut tr wget
13

Usage: t2s 'How are you?'

Nice because it automatically names the mp3 file up to 15 characters

Modified (uses bash manip instead of tr)

t2s() { wget -q -U Mozilla -O $(cut -b 1-15

cat file{0..5} > mainfile
2013-08-17 04:15:45
User: snipertyler
Functions: cat
3

After splitting a file, put them all back together a lot faster then doing

cat file1 file2 file3 file4 file5 > mainfile

or

for i in {0..5}; do cat file$i > mainfile; done

When splitting, be sure to do split -d

for getting numbers instead of letters

for i in {1..20}; do fortune -w ; sleep 3; clear; done
2013-08-16 03:06:48
User: snipertyler
Functions: sleep
5

If you're a slow reader and/or you like to ponder, adjust the sleep time to be longer

function ytmp3() { while (($#)); do (cd ~/Music; echo "Extracting mp3 from $(youtube-dl -e $1)"; /usr/bin/youtube-dl -q -t --extract-audio --audio-format mp3 $1); shift; done ; }
2013-08-08 06:44:29
User: snipertyler
Functions: cd echo
2

Usage: ytmp3 "YTurl" "YTurl2" "YTurl3" "YTurlN"

Uses the shift command to let you extract the .mp3 from as many youtube urls as you like (or wherever else youtube-dl is supported)

*Requires youtube-dl

Orginal chunk of code:

youtube-dl -q -t --extract-audio --audio-format mp3 URL

taken from here http://www.commandlinefu.com/commands/view/9701/convert-youtube-videos-to-mp3