All commands (13,033)


  • 2
    denyhosts-remove $IP_ADDRESS
    linuxrawkstar · 2009-11-19 16:28:34 7
  • This uses urandom to produce a random password. The random values are uuencoded to ensure only printable characters. This only works for a number of characters between 1 and 60. Show Sample Output


    -3
    mkpasswd() { head -c $(($1)) /dev/urandom | uuencode - | sed -n 's/.//;2s/\(.\{'$1'\}\).*/\1/p' ;}
    taliver · 2009-11-19 14:27:52 2
  • Iozone with a file of 2GB, 64KB record size, write/rewrite and read/re-read test, using just one thread. Show Sample Output


    0
    iozone -s 2g -r 64 -i 0 -i 1 -t 1
    w00binda · 2009-11-19 10:43:54 0

  • 1
    sync; time `dd if=/dev/cciss/c0d1p1 of=/dev/null bs=1M count=10240`
    w00binda · 2009-11-19 10:34:13 0

  • 0
    sync; time `dd if=/dev/zero of=bigfile bs=1M count=2048 && sync`
    w00binda · 2009-11-19 10:29:03 1
  • Must have the video open and fully loaded.


    -2
    video=$(ls /tmp | grep -e Flash\w*); ffmpeg -i /tmp/$video -f mp3 -ab 192k ~/ytaudio.mp3
    aperson · 2009-11-19 09:25:10 3
  • If you are behind a restrictive proxy/firewall that blocks port 22 connections but allows SSL on 443 (like most do) then you can still push changes to your github repository. Your .ssh/config file should contain: Host * ForwardX11 no TCPKeepAlive yes ProtocolKeepAlives 30 ProxyCommand /usr/local/bin/proxytunnel -v -p -d %h:443 Host User git Hostname ssh.github.com ChallengeResponseAuthentication yes IdentityFile ~/.ssh/id_rsa IdentitiesOnly yes Basically proxytunnel "tunnels" your ssh connection through port 443. You could also use corkscrew or some other tunneling program that is available in your distro's repository. PS: I generally use "github.com" as the SSH-HOST so that urls of the kind git@github.com:USER/REPO.git work transparently :) You


    3
    git remote add origin git@SSH-HOST:<USER>/<REPOSITORY>.git
    jnash · 2009-11-19 06:57:50 1
  • I know this has been beaten to death but finding video files using mime types and printing the "hours of video" for each directory is (IMHO) easier to parse than just a single total. Output is in minutes. Among the other niceties is that it omits printing of non-video files/folders PS: Barely managed to fit it within the 255 character limit :D Show Sample Output


    0
    for item in *;do echo -n "$item - ";find "$item" -type f -print0 | xargs -0 file -iNf - | grep video | cut -d: -f1 | xargs -d'\n' /usr/share/doc/mplayer/examples/midentify | grep ID_LENGTH | awk -F= '{sum+=$2} END {print(sum/60)}'; done | grep -v ' - 0$'
    jnash · 2009-11-19 06:28:15 0
  • Uses mime-type of files rather than relying on file extensions to find files of a certain type. This can obviously be extended to finding files of any other type as well.. like plain text files, audio, etc.. In reference to displaying the total hours of video (which was earlier posted in command line fu, but relied on the user having to supply all possible video file formats) we can now do better: find ./ -type f -print0 | xargs -0 file -iNf - | grep video | cut -d: -f1 | xargs -d'\n' /usr/share/doc/mplayer/examples/midentify | grep ID_LENGTH | awk -F "=" '{sum += $2} END {print sum/60/60; print "hours"}'


    0
    find ./ -type f -print0 | xargs -0 file -iNf - | grep video | cut -d: -f1
    jnash · 2009-11-19 06:05:36 3
  • I modify 4077 and marssi commandline to simplify it and skip an error when parsing the first line of lsmod (4077). Also, it's more concise and small now. I skip using xargs ( not required here ). This is only for GNU sed. For thoses without GNU sed, use that : modinfo $(lsmod | awk 'NR>1 {print $1}') | sed -e '/^dep/s/$/\n/g' -e '/^file/b' -e '/^desc/b' -e '/^dep/b' -e d


    6
    modinfo $(cut -d' ' -f1 /proc/modules) | sed '/^dep/s/$/\n/; /^file\|^desc\|^dep/!d'
    sputnick · 2009-11-18 23:40:46 1
  • Alternately for those without getent or only want to work on local users it's even easier: cut -d: -f1 /etc/passwd|xargs -n1 passwd -e Note that not all implementations of passwd support -e. On RH it would be passwd -x0 (?) and on Solaris it would be passwd -f.


    0
    getent passwd|cut -d: -f1|xargs -n1 passwd -e
    romulusnr · 2009-11-18 19:46:15 0
  • Substitute feh for the image viewer of your choice. display (part of imagemagick) seems to be a popular choice.


    3
    apod(){ local x=http://antwrp.gsfc.nasa.gov/apod/;feh $x$(curl -s ${x}astropix.html|grep -Pom1 'image/\d+/.*\.\w+');}
    eightmillion · 2009-11-18 12:06:03 2
  • 0-1279 = desktop 1 region = face 1 1280-2559 = face 2 ==>> wmctrl 1280 = wmctrl (1281,...2559) are all the same for a 1280 monitor resolution math: argument of wmctrl -o = ( DesiredFace * HorizontalResolution - 1)


    1
    wmctrl -o 1280,0
    m33600 · 2009-11-18 11:06:29 0
  • Liked command 4077 so I improved it, by doing all text manipulation with sed. "Run this as root, it will be helpful to quickly get information about the loaded kernel modules." THX mohan43u Show Sample Output


    1
    lsmod | sed -e '1d' -e 's/\(\([^ ]*\) \)\{1\}.*/\2/' | xargs modinfo | sed -e '/^dep/s/$/\n/g' -e '/^file/b' -e '/^desc/b' -e '/^dep/b' -e d
    marssi · 2009-11-17 22:51:08 0
  • The above code is just an example of printing on the same line, hit Ctrl + C to stop When using echo -ne "something\r", echo will: - print "something" - dont print a new line (-n) - interpret \r as carriage return, going back to the start of the line (-e) Remember to print some white spaces after the output if your command will print lines of different sizes, mainly if one line will be smaller than the previous Edit from reading comments: You can achieve the same effect using printf (more standardized than echo): while true; do printf "%-80s\r" "$(date)"; sleep 1; done


    12
    while true; do echo -ne "$(date)\r"; sleep 1; done
    polaco · 2009-11-17 22:45:37 4
  • This command creates and burns a gapless audio CD with 99 tracks. Each track is a 30 second sine wave, the first is 1 Hz, the second 2 Hz, and so on, up to 99 Hz. This is useful for testing audio systems (how low can your bass go?) and for creating the constant vibrations needed to make non-Newtonian fluids (like cornstarch and water) crawl around. Note, this temporarily creates 500MB of .cdda files in the current directory. If you don't use the "rm" at the end of the command, you can burn more disks using cdrdao write cdrdao.toc Prerequisites: a blank CD-R in /dev/cdrw, sox (http://sox.sourceforge.net/), and cdrdao (http://cdrdao.sourceforge.net/). I'm also assuming a recent version of bash for the brace expansion (which just looks nicer than using seq(1), but isn't necessary). Show Sample Output


    23
    (echo CD_DA; for f in {01..99}; do echo "$f Hz">&2; sox -nt cdda -r44100 -c2 $f.cdda synth 30 sine $f; echo TRACK AUDIO; echo FILE \"$f.cdda\" 0; done) > cdrdao.toc && cdrdao write cdrdao.toc && rm ??.cdda cdrdao.toc
    hackerb9 · 2009-11-17 06:23:42 3
  • midentify.sh is part of mplayer, but you might have to locate it on your box. Show Sample Output


    4
    /usr/share/mplayer/midentify.sh `find . -name "*.avi" -print` | grep ID_LENGTH | awk -F "=" '{sum += $2} END {print sum/60/60; print "hours"}'
    equant · 2009-11-17 03:33:20 5
  • Run this as root, it will be helpful to quickly get information about the loaded kernel modules. Show Sample Output


    2
    lsmod | cut -d' ' -f1 | xargs modinfo | egrep '^file|^desc|^dep' | sed -e'/^dep/s/$/\n/g'
    mohan43u · 2009-11-17 02:13:34 0
  • why would you want to convert mp3's to ogg? 1 reason is because ardour doesn't support mp3 files because of legal issues. this is really the only reason you would do this, unless you have really bad hearing and also want smaller file sizes, because converting from one lossy format to another isn't a good idea. Show Sample Output


    -1
    mp32ogg file.mp3
    nickleus · 2009-11-16 20:22:48 0
  • or change the frequency of the beep


    0
    setterm -bfreq 0
    mvrilo · 2009-11-16 17:34:39 0
  • -p -> loop (same as -n in sed) -i -> edit files -e -> execute command replace Old with New in all *.html files


    -4
    perl -p -i -e ?s/New/Old/g? *.html
    chappado · 2009-11-16 13:40:13 2
  • This bash function uses albumart.org to find the cover for an album. It returns an amazon.com url to the image. Usage: albumart [artist] [album] These arguments can be reversed and if the album name is distinct enough, it may be possible to omit the artist. The command can be extended with wget to automatically download the matching image like this: albumart(){ local x y="$@";x=$(awk '/View larger image/{gsub(/^.*largeImagePopup\(.|., .*$/,"");print;exit}' <(curl -s 'http://www.albumart.org/index.php?srchkey='${y// /+}'&itempage=1&newsearch=1&searchindex=Music'));[ -z "$x" ]&&echo "Not found."||wget "$x" -O "${y}.${x##*.}";} Show Sample Output


    7
    albumart(){ local y="$@";awk '/View larger image/{gsub(/^.*largeImagePopup\(.|., .*$/,"");print;exit}' <(curl -s 'http://www.albumart.org/index.php?srchkey='${y// /+}'&itempage=1&newsearch=1&searchindex=Music');}
    eightmillion · 2009-11-15 19:54:16 1
  • If used without arguments, returns own IP info. If used with argument, returns info about the parsed argument. Show Sample Output


    0
    geoip () { curl -s "http://www.geoiptool.com/?IP=$1" | html2text | egrep --color 'City:|IP Address:|Country:' }
    wizel · 2009-11-15 17:59:23 0
  • geoip from maxmind try to get the small utility via: apt-get install geoip Show Sample Output


    0
    geoiplookup www.commandlinefu.com
    Sunng · 2009-11-15 11:56:19 0
  • This command lets you select from 10 different BBC stations. When one is chosen, it streams it with mplayer. Requires: mplayer with wma support.


    23
    bbcradio() { local s PS3="Select a station: ";select s in 1 1x 2 3 4 5 6 7 "Asian Network an" "Nations & Local lcl";do break;done;s=($s);mplayer -playlist "http://www.bbc.co.uk/radio/listen/live/r"${s[@]: -1}".asx";}
    eightmillion · 2009-11-14 08:17:03 14
  • ‹ First  < 380 381 382 383 384 >  Last ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. 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.

Share Your Commands



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: