All commands (12,646)

  • In this case it's better do to use the dedicated tool


    43
    ssh-keygen -R <the_offending_host>
    bunam · 2010-07-11 19:37:24 0
  • I did not know this, i'd like to share...


    43
    open .
    vigo · 2009-06-10 10:55:20 14
  • Also works with: chgrp --reference file1 file2 chown --reference file1 file2


    42
    chmod --reference file1 file2
    rpavlick · 2010-03-31 12:05:48 1
  • If you want a visual representation of the parent/child relationships between processes, this is one easy way to do it. It's useful in debugging collections of shell scripts, because it provides something like a call traceback. When a shell script breaks, just remember "awwfux".


    42
    ps awwfux | less -S
    ToyKeeper · 2009-07-04 09:39:28 4
  • Directly attach a remote screen session (saves a useless parent bash process)


    41
    ssh -t remote_host screen -r
    recursiverse · 2009-07-23 06:15:04 7
  • Good for one off jobs that you want to run at a quiet time. The default threshold is a load average of 0.8 but this can be set using atrun. Show Sample Output


    41
    echo "rm -rf /unwanted-but-large/folder" | batch
    root · 2009-02-04 19:07:52 3
  • This command shows the various shortcuts that can be use in bash, including Ctrl+L, Ctrl+R, etc... You can translate "\C-y" to Ctrl+y, for example. Show Sample Output


    40
    bind -P
    ricardofunke · 2012-05-28 18:51:59 3

  • 40
    timeout 5s COMMAND
    kev · 2011-11-19 06:14:33 2
  • just make some data scrolling off the terminal. wow.


    40
    cat /dev/urandom | hexdump -C | grep "ca fe"
    BOYPT · 2010-09-27 08:20:44 4

  • 40
    find . -type d -empty -delete
    jmcantrell · 2010-03-23 15:21:33 1
  • Uses shell expansion to create a back-up called file.txt.bak


    40
    cp file.txt{,.bak}
    root · 2009-01-26 12:11:29 1
  • You can get one specific line during any procedure. Very interesting to be used when you know what line you want. Show Sample Output


    39
    sed -n 5p <file>
    Waldirio · 2009-10-15 11:00:48 3
  • Of course you need to be able to access host A for this ;-)


    39
    ssh -t hostA ssh hostB
    0x89 · 2009-08-27 21:35:19 4

  • 39
    tar -tf <file.tar.gz> | xargs rm -r
    prayer · 2009-07-06 22:23:11 3
  • If you enable multiuser, then you can permit others to share your screen session. The following conditions apply: 1. screen must be suid root; 2. "multiuser on" must be configured in ~/.screenrc; 3. control the others user(s) access with "aclchg": # ----- from ~/.screenrc-users ----- aclchg someuser +rx "#?" #enable r/o access to "someuser" aclchg someuser -x "#,at,aclchg,acladd,acldel,quit" # don't allow these aclchg otheruser +rwx "#?" # enable r/w access to "otheruser" aclchg otheruser -x "#,at,aclchg,acladd,acldel,quit" # don't allow them to use these commands # ----- After doing this (once), you start your session with: $ screen Then, the other user can join your terminal session(s) with youruserid: $ screen -r youruserid/ Note: the trailing "/" is required. Multiple users can share the same screen simultaneously, each with independent access controlled precisely with "aclchg" in the ~/.screenrc file. I use the following setup: # ~/.screenrc-base # default screenrc on any host source $HOME/.screenrc-base source $HOME/.screenrc-$HOST source $HOME/.screenrc-users # ----- Then, the base configurations are in ~/.screenrc-base; the host-specific configurations are in ~/.screenrc-$HOST, and the user configurations are in ~/.screenrc-users. The host-specific .screenrc file might contain some host-specific screen commands; e.g.: # ~/.screen-myhost # ----- screen -t 'anywhere' /bin/tcsh screen -t 'anywhere1' /bin/tcsh # ---- The .screenrc-base contains: # ~/.screenrc-base ## I find typing ^a (Control-a) awkward. So I set the escape key to CTRL-j instead of a. escape ^Jj termcapinfo xterm* ti@:te@: autodetach on zombie kr verbose on multiuser on


    39
    % screen -r someuser/
    totoro · 2009-03-25 23:59:38 1
  • RTFMFTW.


    38
    rtfm() { help $@ || man $@ || $BROWSER "http://www.google.com/search?q=$@"; }
    hunterm · 2011-01-05 02:53:38 2
  • run 'nc yourip 5000', 'nc yourip 5001' or 'nc yourip 5002' elsewhere will produce an exact same mirror of your shell. This is handy when you want to show someone else some amazing stuff in your shell without giving them control over it.


    38
    script -qf | tee >(nc -kl 5000) >(nc -kl 5001) >(nc -kl 5002)
    clvv · 2010-10-11 07:55:30 12
  • Google just released a new commend line tool offering all sorts of new services from the commend line. One of them is uploading a youtube video but there are plenty more google services to interact with. Download it here: http://code.google.com/p/googlecl/ Manual: http://code.google.com/p/googlecl/wiki/Manual This specific command courtesy of lifehacker:http://lifehacker.com/5568817/ Though all can be found in manual page linked above. Show Sample Output


    38
    google docs edit --title "To-Do List" --editor vim
    spiffwalker · 2010-06-21 16:15:42 3
  • This command takes a snapshot of the open files for a PID 1234 then waits 10 seconds and takes another snapshot of the same PID, it then displays the difference between each snapshot to give you an insight into what the application is doing.


    38
    diff <(lsof -p 1234) <(sleep 10; lsof -p 1234)
    zlemini · 2010-03-15 22:55:32 1
  • The empty file /forcefsck causes the file system check fsck to be run next time you boot up, after which it will be removed. This works too: sudo >/forcefsck


    38
    sudo touch /forcefsck
    johnraff · 2009-10-29 17:04:47 6
  • Change Seville for your prefered city. Show Sample Output


    37
    curl wttr.in/seville
    nordri · 2016-08-28 09:43:38 8

  • 37
    until !!; do :; done
    unixmonkey21806 · 2013-05-14 18:08:54 3
  • Shorter, easier to remember version of cmd#7636 NTP is better, but there are situations where it can't be used. In those cases, you can do this to sync the local time to a server. Show Sample Output


    37
    date --set="$(ssh user@server date)"
    splante · 2011-08-30 20:03:06 3
  • EDIT: command updated to support accented characters! Works in any of 58 google supported languages (some sound like crap, english is the best IMO). You get a mp3 file containing your query in spoken language. There is a limit of 100 characters for the "q" parameter, so be careful. The "tl" parameter contains target language.


    37
    wget -q -U Mozilla -O output.mp3 "http://translate.google.com/translate_tts?ie=UTF-8&tl=en&q=hello+world
    sairon · 2011-03-08 14:05:36 12
  • -d: list directory entries instead of contents, and do not dereference symbolic links


    37
    ls -d */
    brianmuckian · 2009-10-08 22:07:22 0
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