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.

OpenID

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:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands tagged alsa

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

Functions

Hide

Credits

Site by David Winterbottom (user root).

Commands tagged alsa

Terminal - Commands tagged alsa - 11 results

amixer -c 0 set Master 100%

2013-03-28 16:30:10

User: thewarden

Functions: amixer set

Tags: audio alsa Linux UNIX

Up
Down

Set audio card 0 master volumn to maximum

Replace "Master" with desired control name (e.g. Front, Earphone, PCM, etc.).

a=$(xwininfo |gawk 'BEGIN {FS="[x+ \t]*"} /-geometry/ {print int(($3+1)/2)*2"x"int(($4+1)/2)*2"+"$5"+"$6}') ; echo ${a} ; ffmpeg -f x11grab -s ${a} -r 10 -i :0.0 -sameq -f mp4 -s wvga -y /tmp/out.mpg

2012-08-31 14:48:41

User: dwygo

Functions: echo gawk

Tags: ffmpeg awk alsa xwininfo x11grab mp4 wvga

Up
Down

Capture screen and mic input using FFmpeg and ALSA

Now we can capture only a specific window (we have to chose by clicking on it)

ffmpeg complains about "Frame size must be a multiple of 2" so we calculate the upper even number with (g)awk trickery.

We remove the grep, we are already using (g)awk here ....why losing time with grep !!! ;)

aumix -v +5

2011-07-24 07:41:40

User: h3xx

Functions: aumix

Tags: alsa

Up
Down

Ramp the system volume up 5%

Or,

aumix -v -5

Map these to key combinations in your window manager and who needs special buttons?

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

sox -t alsa default ./recording.flac silence 1 0.1 5% 1 1.0 5%

2011-03-08 14:36:39

User: sairon

Tags: audio record alsa speech

Up
Down

SoX recording audio and trimming silence

Records audio from your mic in FLAC (Free Lossless Audio Codec) format, starts only after it detects at least 0.1 seconds of noise and stops after 1 second of silence. You can adjust the percent values (sensitivity) to best fit your microphone and voice (0.1% if you have a great quality mic, higher if you don't, 0% does not trim anything).

Useful for speech recognition in conjunction with my previous command titled 'Google voice recognition "API"' (http://www.commandlinefu.com/commands/view/8043/google-voice-recognition-api).

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

ssh [user]@[host] "ogg123 -" < [podcast].ogg

2010-07-30 22:10:22

User: denzuko

Functions: ssh

Tags: ssh ogg pulseaudio alsa mpg321

Up
Down

Stream audio over ssh ogg version

Stream OGG vorbis over ssh.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

ssh [user]@[address] "mpg321 -" < [file].mp3

2010-07-30 00:23:13

User: leovailati

Functions: ssh

Tags: ssh pulseaudio alsa mpg321

Up
Down

Stream audio over ssh

This one doesn't need to convert to wav.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

sox Klaxon.mp3 -t wav - |ssh thelab@company.com paplay

2010-07-29 23:23:39

User: camocrazed

Functions: ssh

Tags: ssh pulseaudio alsa sox

Up
Down

Stream audio over ssh

This will allow you to convert an audio file to wav format, and send it via ssh to a player on the other computer, which will open and play it there. Of course, substitute your information for the sound file and remote address

You do not have to use paplay on the remote end, as it is a PulseAudio thing. If the remote end uses ALSA, you should use aplay instead. If it uses OSS, you should berate them about having a lousy sound system. Also, you're not limited to transmitting encoded as wav either, it's just that AFAIK, most systems don't come with mp3 codecs, but will play wav files fine.

If you know SoX is installed on the remote end and has mp3 codecs, you can use the following instead:

cat Klaxon.mp3 |ssh thelab@company.com play -t mp3 -

this will transmit as mp3. Again, use your specific information. if you're not playing mp3s, use another type with the -t option

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

lsof /dev/snd/pcm*p /dev/dsp | awk ' { print $2 }' | xargs kill

2010-07-23 20:24:16

User: alustenberg

Functions: awk xargs

Tags: awk flash xargs kill sound lsof alsa

Up
Down

give me back my sound card

for when a program is hogging the sound output. finds, and kills. add -9 to the end for wedged processes. add in 'grep ^program' after lsof to filter.

ffmpeg -f alsa -itsoffset 00:00:02.000 -ac 2 -i hw:0,0 -f x11grab -s $(xwininfo -root | grep 'geometry' | awk '{print $2;}') -r 10 -i :0.0 -sameq -f mp4 -s wvga -y intro.mp4

2010-03-31 09:33:05

User: mohan43u

Functions: awk grep

Tags: ffmpeg awk grep alsa xwininfo x11grab mp4 wvga

Up
Down

Capture screen and mic input using FFmpeg and ALSA

Yet another x11grab using ffmpeg. I also added mic input to the capturing video stream using alsa. Yet I need to find out how to capture audio which is currently playing.

ffmpeg -f alsa -ac 2 -i hw:1,0 -acodec libmp3lame -ab 96k output.mp3

2009-09-16 12:45:44

User: ivalladt

Tags: audio ffmpeg mp3 lame alsa

Up
Down

Record MP3 audio via ALSA using ffmpeg

Record audio to an MP3 file via ALSA. Adjust -i argument according to arecord -l output.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

ffmpeg -f alsa -r 16000 -i hw:2,0 -f video4linux2 -s 800x600 -i /dev/video0 -r 30 -f avi -vcodec mpeg4 -vtag xvid -sameq -acodec libmp3lame -ab 96k output.avi

2009-09-15 17:03:25

User: ivalladt

Tags: video audio ffmpeg mp3 avi webcam divx mpeg4 alsa

Up
Down

Record audio and video from webcam using ffmpeg

Record from a webcam, audio using ALSA encoded as MP3, video as MPEG-4.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate