All commands (14,187)

  • Read a gzipped text file directly with less.

    There is no need to 'zcat textfile.gz | less' with newer distros. This is useful for reading archived log files without having to extract, read, and zip when done.


    -5
    less textfile.gz
    allbad · 2009-03-15 23:51:17 24
  • reloads sound when it stop playing

    if you lose your sound, this will restart alsa and you will get your sound back


    -5
    sudo alsa force-reload
    oreo · 2009-02-16 03:30:13 170
  • Play newest or random YouTube video


    -5
    oumou sangare
    gabougabou · 2010-04-12 21:45:02 5
  • fb


    -5
    lynx -useragent=Opera -dump 'http://www.facebook.com/ajax/typeahead_friends.php?u=4&__a=1' |gawk -F'\"t\":\"' -v RS='\",' 'RT{print $NF}' |grep -v '\"n\":\"' |cut -d, -f2
    pdan_23 · 2010-04-13 12:44:08 5
  • Network Information


    -5
    ntop
    theIndianMaiden · 2009-08-16 05:24:31 4
  • glob /mnt

    _ff(){ cd /mnt; echo /mnt/*/* |sed ' s/ \/mnt\//\&/g; '|sed '/'"$1"'/!d'; cd -; } ff(){ case $# in 0) echo "usage: ff glob [sed-cmds] [--|var-name]" ;; 1) _ff $1 |sed = ;; [2-9]) case $2 in --) _ff $1 |less -SN ;; *) _ff $1 |sed -n ''"$2"''|tr '\n' '\040' |sed 's/.*/export '"$3"'=\"&/;s/=\" /=\"/;s/ $/\"/' > $HOME/.ff; case $# in 3) . $HOME/.ff ;; esac; sed ' s/export .*=\"/\$'"$3"' = \"/;' $HOME/.ff;\ ;; esac ;; esac; } v(){ local a=$HOME; sed ' s/export /less -n \$/; s/=.*//; ' $a/.ff > $a/.v ; . $a/.v ; } Another approach using ls(1) lsl(){ _lsl () { ls -l $3 /mnt/*/$1* 2>/dev/null; }; case $# in 0) echo "usage: lsl pat [ls-options|result-no]"; echo "usage: lsle pat [sed-cmds]" ;; 1) _lsl $1 |sed = ;; 2) case $2 in -*) _lsl $1 $@;; *) _lsl $1 |sed 's/.* //; '"$2"'!d; '"$2"'q' > $HOME/.lsl ; export v=$(sed 1q $HOME/.lsl); echo \$v = $v ;; esac ;; esac; } exp(){ echo "%s/\$/ /"; echo "%j"; echo "s/^/export v=\""; echo "s/\$/\""; echo "s/ \"\$/\""; echo "."; echo "wq"; } lsle(){ lsl $1 -1 |sed $2 > .lsl&& exp |ed -s .lsl >&-&& . .lsl&& echo \$v = $v; }


    -5
    _ff(){ cd /mnt;echo /mnt/*/* |sed 's/ \/mnt\//\&/g' |sed '/'"$1"'/!d'; cd -;}
    argv · 2011-12-30 23:25:31 5
  • Forget remembered path locations of previously ran commands


    -5
    rehash
    Octave · 2010-06-18 15:29:17 6
  • Add a folder to PATH

    only during session


    -5
    export PATH=$PATH:/home/user/my_prog
    sentenza · 2014-11-04 20:50:19 7
  • View process statistics in realtime

    A simple but effective replacement for ps aux. I used to waste my time running ps over and over; top is the way to go. It also allows complex sorting options. Press q to exit "nicely" (Ctrl + C is always an option, of course). Note that the list updates each second, resorting in the process; if you're trying to grab a specific PID, you might be better off with ps. htop Alternatively, htop is available, though it may not come pre-installed. htop is slightly more interactive than top and includes color coding, visuals, and a nice interface for selecting and then killing processes. (Thanks to bwoodacre for this great tool.) Show Sample Output


    -5
    top
    Zenexer · 2009-03-18 00:03:42 10
  • Kill a process by application

    The pgrep retrieves the PID, then the KILL receive it, and kill it... It works also if the application has more than one instance.... Show Sample Output


    -5
    kill -9 `pgrep $PROCESS_NAME`
    juanse006 · 2010-06-18 20:43:24 9
  • Check your running Ubuntu version


    -5
    lsb_release -a
    ShaneEaston · 2012-03-27 15:47:29 61
  • Kill a daemon by name, not by PID

    Just find out the daemon with $ netstat -atulpe. Then type in his name and he gets the SIGTERM.


    -5
    kill_daemon() { echo "Daemon?"; read dm; kill -15 $(netstat -atulpe | grep $dm | cut -d '/' -f1 | awk '{print $9}') }; alias kd='kill_daemon
    P17 · 2009-05-26 20:39:56 7
  • Print a list of installed Perl modules

    IMVHO if you are using cpan to install perl modules you are doing it wrong. Show Sample Output


    -5
    dpkg-query -W | grep perl
    unixmonkey10924 · 2010-07-20 16:14:04 4
  • Post to twitter via curl, Windows version

    Aside from curl one will need iconv windows binary since windows lacks a native utf-8 cli interface. In my case I need a proxy in China and iconv to convert gbk status string into utf-8. GnuWin32 is a good choice with loads of coreutils natively ported to Windows "FOR /f" is the solution to pass iconv output to curl.


    -5
    FOR /f %%g in ('echo %1 ^| iconv -f gbk -t utf-8') DO curl -x proxy:port -u user:pass -d status=%%g -d source="cURL" http://twitter.com/statuses/update.xml
    MeaCulpa · 2010-07-21 04:53:54 3
  • sed -n "$LINE1,${LINE2}p;${LINEA2}q;" "$FILE"

    If you need to print some portion of a huge file, let's say you want to print from line 200 to 300, you can use this command to print the line from LINE1 to LINE2 of file FILE.


    -5
    Printing portion of a big file
    acirulli · 2009-03-30 11:08:38 6
  • Delete a file securely by overwriting its contents


    -5
    shred -v filename
    techie · 2013-05-07 14:58:17 6
  • Random Beeps on Your PC Speaker

    Sends random beeps to your PC-speaker. Think... You can also run it remotely on another computer using SSH and scare its user! Don't forget to run it on your dedicated hosting server and watch sysadmin's action from data-center's live remote cameras!


    -5
    dd if=/dev/urandom of=/dev/speaker bs=1
    khashmeshab · 2010-10-27 09:22:40 7
  • How many lines does the passwd file have?


    -5
    awk 'END {print NR}' /etc/passwd
    Leo_Gutierrez · 2011-06-23 00:33:40 3
  • Random Beeps on Your Audio Card's Output

    Sends random sounds to your sound card output (e.g. your speaker). Think... You can also run it remotely on another computer using SSH and scare its user!


    -5
    dd if=/dev/urandom of=/dev/dsp
    khashmeshab · 2010-10-27 09:25:02 3
  • doing some math...


    -5
    echo 1+1|bc
    gnawa · 2009-02-19 13:46:58 5
  • Whois on target and save results to file instantly

    This can be used in scripts, to find out the origin of target IP etc. Show Sample Output


    -5
    x=192.168.1.1; whois $x > $x.txt
    sxiii · 2011-01-17 03:33:49 9
  • Bash logger


    -5
    echo -en "$USER@$HOSTNAME:${PWD##*/}> ";while read x;do echo $x>>/tmp/log.txt;echo $x|$0 2>&1;echo -en "$USER@$HOSTNAME:${PWD##*/}> ";done
    Nikon · 2011-01-17 20:53:28 13
  • Kill process you don't know the PID of, when pidof and pgrep are not available.

    This will kill a specific process you don't know the PID of, when pidof and pgrep are not available, for example on OS X. var1 is created so that the whitespace can be trimmed before passing off to kill. Show Sample Output


    -5
    export var1=`ps -A | grep '[u]nique' | cut -d '?' -f 1`; echo${var1/ /}; kill -9 $var1
    headyadmin · 2010-03-22 21:06:58 5
  • Concatenate lines of to files, one by one


    -6
    join file1.txt file2.txt > file3.txt
    olafrv · 2009-03-01 05:12:07 5
  • Refined repository search

    replace apt-get with your distro's package manager. Where 'something' is the package name, and 'specific' is what you're specifically looking for. This helps if your query is 2+ words long. Show Sample Output


    -6
    apt-get search something | grep specific
    ProfOak · 2010-09-27 07:10:39 30
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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Compute newest kernel version from Makefile on Torvalds' git repository
The platform-agnostic version of https://www.commandlinefu.com/commands/view/25276/compute-newest-kernel-version-from-makefile-on-torvalds-git-repository because macOS doesn't have wget installed

determine if a shared library is compiled as 32bit or 64bit
Determines the flavor of a shared library by looking at the addresses of its exposed functions and seeing if they are 16 bytes or 8 bytes long. The command is written so the library you are querying is passed to a variable up font -- it would be simple to convert this to a bash function or script using this format.

print contents of file from line 1 until we match regex
Start printing the contents of filename to stdout, until a matching line to regex is found, then stop.

website recursive offline mirror with wget
website recursive offline mirror with wget

How to copy CD/DVD into hard disk (.iso)
A dear friend of mine asked me how do I copy a DVD to your hard drive? If you want to make a copy of the ISO image that was burned to a CD or DVD, insert that medium into your CD/DVD drive and (assuming /dev/cdrom is associated with your computer?s CD drive) type the following command

Get your external IP address

Get max number of arguments
Get max number of arguments that can be accepted by the exec() system call.

generate random tone

Convert decimal numbers to binary
Convert some decimal numbers to binary numbers. You could also build a general base-converter: $ function convBase { echo "ibase=$1; obase=$2; $3" | bc; } then you could write $ function decToBun { convBase 10 2 $1; }

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