Commands tagged Linux (264)

  • In the above example 'muspi merol' (the output of the first rev command) is sent to stderr and 'lorem ipsum' (the output of the second rev command) is sent to stdout. rev reverse lines of a file or files. This use of tee allows testing if a program correctly handles its input without using files that hold the data. Show Sample Output

    rev <<< 'lorem ipsum' | tee /dev/stderr | rev
    penpen · 2009-03-31 13:12:09 2
  • There was another line that was dependent on having un-named screen sessions. This just wouldn't do. This one works no matter what the name is. A possible improvement would be removing the perl dependence, but that doesn't effect me.

    for i in `screen -ls | perl -ne'if(/^\s+\d+\.([^\s]+)/){print $1, " "}'`; do gnome-terminal -e "screen -x $i"; done
    hank · 2009-04-25 22:39:24 1
  • Shell timeout variables (TMOUT) can be very liberal about what is classified as 'activity', like having an editor open. This command string will terminate the login shell for an user with more than a day's idle time.

    fuser -k `who -u | awk '$6 == "old" { print "/dev/"$2'}`
    lbonanomi · 2009-09-07 03:36:43 2
  • This command gives you the charset of a text file, which would be handy if you have no idea of the encoding. Show Sample Output

    file -i <textfile>
    juvenn · 2009-09-08 01:33:19 1
  • This command will transcode a MythTV recording. The target device is a Google Nexus One mobile phone. My recordings are from a HDHomerun with Over The Air content. Plays back nicely on the N1.

    ffmpeg -i /var/lib/mythtv/pretty/Chuck20100208800PMChuckVersustheMask.mpg -s 800x480 -vcodec mpeg4 -acodec libfaac -ac 2 -ar 16000 -r 13 -ab 32000 -aspect 16:9 Chuck20100208800PMChuckVersustheMask.mp4
    PLA · 2010-02-12 12:11:02 0
  • extension to tali713's random fact generator. It takes the output & sends it to notify-osd. Display time is proportional to the lengh of the fact.

    wget -O - 2>/dev/null | grep \<strong\> | sed "s;^.*<i>\(.*\)</i>.*$;\1;" | while read FUNFACT; do notify-send -t $((1000+300*`echo -n $FUNFACT | wc -w`)) -i gtk-dialog-info "RandomFunFact" "$FUNFACT"; done
    mtron · 2010-04-02 09:43:32 1
  • A little aptitude magic. Note: this will remove images AND headers. If you just want to remove images: aptitude remove ?and(~i~nlinux-im ?not(~n`uname -r`)) I used this in zsh without any problems. I'm not sure how other shells will interpret some of the special characters used in the aptitude search terms. Use -s to simulate.

    aptitude remove ?and(~i~nlinux-(im|he) ?not(~n`uname -r`))
    dbbolton · 2010-06-11 22:57:09 0
  • Specify the size in bytes using the 'c' option for the -size flag. The + sign reads as "bigger than". Then execute du on the list; sort in reverse mode and show the first 10 occurrences. Show Sample Output

    find /myfs -size +209715200c -exec du -m {} \; |sort -nr |head -10
    arlequin · 2011-07-07 21:12:46 0
  • this will open a new tab in firefox for every line in a file the sleep is removable but i found that if you have a large list of urls 50+, and no sleep, it will try to open all the urls at once and this will cause them all to load a lot slower, also depending on the ram of your system sleep gives you a chance to close the tabs before they overload your ram, removing & >2/dev/null will yield unpredictable results.

    for line in `cat $file`; do firefox -new-tab "$line" & 2>/dev/null; sleep 1; done
    hamsolo474 · 2011-11-12 13:47:24 0
  • Converts a number of bytes provided as input, to a human readable number. Show Sample Output

    human_filesize() { awk -v sum="$1" ' BEGIN {hum[1024^3]="Gb"; hum[1024^2]="Mb"; hum[1024]="Kb"; for (x=1024^3; x>=1024; x/=1024) { if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x]; break; } } if (sum<1024) print "1kb"; } '}
    ArtBIT · 2011-12-02 18:21:20 0
  • "What it actually shows is going to be dependent on the commands you've previously entered. When you do this, bash looks for the last command that you entered that contains the substring "ls", in my case that was "lsof ...". If the command that bash finds is what you're looking for, just hit Enter to execute it. You can also edit the command to suit your current needs before executing it (use the left and right arrow keys to move through it). If you're looking for a different command, hit Ctrl+R again to find a matching command further back in the command history. You can also continue to type a longer substring to refine the search, since searching is incremental. Note that the substring you enter is searched for throughout the command, not just at the beginning of the command." - Show Sample Output

    *deleted* · 2012-04-15 16:42:32 0
  • list the top 15 folders by decreasing size in MB Show Sample Output

    du -xB M --max-depth=2 /var | sort -rn | head -n 15
    bouktin · 2013-05-23 10:45:21 0
  • Optionally, pipe the output into Or: wget -qO - | sed -n '//,//p' | sed -n '/ Show Sample Output

    wget -qO - | sed -n '/<pre>/,/<\/pre>/p' | sed -n '/<table*/,/<\/table>/p' | sed '1d' | sed '$d' | recode html..ascii
    krunktron · 2013-08-17 19:42:47 0

  • 2
    grep -v rootfs /proc/mounts > /etc/mtab
    ohe · 2014-01-21 14:28:12 0
  • To show ipv6 instead, use [[ -6 ]] instead of [[ -4 ]] ip -o -6 a s | awk -F'[ /]+' '$2!~/lo/{print $4}' To show only the IP of a specific interface, in case you get more than one result: ip -o -4 a s eth0 | awk -F'[ /]+' '$2!~/lo/{print $4}' ip -o -4 a s wlan0 | awk -F'[ /]+' '$2!~/lo/{print $4}' Show Sample Output

    ip -o -4 a s | awk -F'[ /]+' '$2!~/lo/{print $4}'
    paulera · 2015-02-13 11:19:31 4

  • 2
    tr '\0' ' ' </proc/21679/cmdline ; echo
    pdxdoughnut · 2015-09-25 22:08:31 5
  • Assumes you've downloaded Toni Corvera's vcs script (, have it in your PATH, and have installed the script's dependencies. Generates a video contact sheet of 24 thumbnails and 3 thumbnails per column. The bold font and white-on-black color scheme keeps the text readable at the chosen 70% JPEG compression quality, which keeps the file size at a manageable level. You can go even lower with the quality and get a good looking result.

    vcs -c 3 -H 220 -n 24 -dt -ds -dp -j --anonymous -O bg_heading=black -O bg_sign=black -O fg_heading=white -O fg_heading=white -O fg_sign=white -O fg_title=white -O font_heading=DejaVu-Sans-Bold -O quality=70
    Negate · 2018-06-06 00:49:25 0
  • Uses the shell builtin `declare` with the '-f' flag to output only functions to grep out only the function names. You can use it as an alias or function like so: alias shfunctions="builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'" shfunctions () { builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'; } Show Sample Output

    builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'
    sciro · 2018-07-23 05:24:04 0
  • explanation: grep -- displays process ids -v -- negates the matching, displays all but what is specified in the other options -u -- specifies the user to display, or in this case negate The process loops through all PIDs that are found by pgrep, then orders a forced kill to the processes in numerical order, effectively killing the parent processes first including the shells in use which will force the users to logout. Tested on Slackware Linux 12.2 and Slackware-current

    for i in $(pgrep -v -u root);do kill -9 $i;done
    lostnhell · 2009-03-24 02:54:52 2
  • and, a lot uglier, with sed: ifconfig | sed -n '/inet addr:/s/[^:]\+:\(\S\+\).*/\1/p' Edit: Wanted to be shorter than the perl version. Still think that the perl version is the best..

    ifconfig | awk -F':| +' '/ddr:/{print $4}'
    0x89 · 2009-07-25 22:51:08 0
  • The initial version of this command also outputted extra empty lines, so it went like this: This happened on Ubuntu, i haven't tested on anything else. Show Sample Output

    ifconfig | awk '/ddr:[0-9]/ {sub(/addr:/, ""); print $2}'
    danny_b85 · 2009-07-31 09:30:54 0
  • default stack size is 10M. This makes your multithread app filling rapidly your memory. on my PC I was able to create only 300thread with default stack size. Lower the default stack size to the one effectively used by your threads, let you create more. ex. putting 64k I was able to create more than 10.000threads. Obviously ...your thread shouldn't need more than 64k ram!!!

    ulimit -s 64
    ioggstream · 2009-08-06 10:40:25 0
  • you must be in the directory to analyse report all files and links in the currect directory, not recursively. this find command ahs been tested on hp-ux/linux/aix/solaris. Show Sample Output

    find . \( ! -name . -prune \) \( -type f -o -type l \)
    mobidyc · 2009-09-12 15:58:56 5
  • USAGE: gate listening_port host port Creates listening socket and connects to remote device at host:port. It uses pipes for connection between two sockets. Traffic which goes through pipes is wrote to stdout. I use it for debug network scripts.

    gate() { mkfifo /tmp/sock1 /tmp/sock2 &> /dev/null && nc -p $1 -l < /tmp/sock1 | tee /tmp/sock2 & PID=$! && nc $2 $3 < /tmp/sock2 | tee /tmp/sock1; kill -KILL $PID; rm -f /tmp/sock1 /tmp/sock2 ; }
    true · 2009-09-25 08:10:23 1

  • 1
    iscsiadm -m discovery -t sendtargets -p
    w00binda · 2009-11-02 16:10:07 0
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Find the most recently changed files (recursively)

Killing processes with your mouse in an infinite loop
Useful for quickly cleaning your Desktop. Nice joke if launched at startup.

list files recursively by size

create new branch from stashed changes
from Useful for when stash cannot be applied to current branch

Virtual Console lock program
vlock command locks the current console by default. Also you can lock all the consoles on the server by using -a parameter. For details, pl man vlock. ps: Generally speaking , system will not install vlock programme . So you should use ' $ sudo apt-get install vlock ' to install vlock .

Count lines in a file with grep
Returns the number of lines in a file, emulates "wc -l" behavior with grep.

Burn CD/DVD from an iso, eject disc when finished.
cdrecord -scanbus will tell you the (x,y,z) value of your cdr (for example, mine is 3,0,0)

Erase a word
hit BACKSPACE more than once to delete more words

Get length of current playlist in xmms2

Find common lines between two files

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