All commands (14,030)

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


    44
    ssh-keygen -R <the_offending_host>
    bunam · 2010-07-11 19:37:24 0
  • You can get one specific line during any procedure. Very interesting to be used when you know what line you want. Show Sample Output


    44
    sed -n 5p <file>
    Waldirio · 2009-10-15 11:00:48 3
  • I did not know this, i'd like to share...


    44
    open .
    vigo · 2009-06-10 10:55:20 14
  • Create a persistent SSH connection to the host in the background. Combine this with settings in your ~/.ssh/config: Host host ControlPath ~/.ssh/master-%[email protected]%h:%p ControlMaster no All the SSH connections to the machine will then go through the persisten SSH socket. This is very useful if you are using SSH to synchronize files (using rsync/sftp/cvs/svn) on a regular basis because it won't create a new socket each time to open an ssh connection.


    44
    ssh -MNf <user>@<host>
    raphink · 2009-02-26 14:11:19 4
  • Also works with: chgrp --reference file1 file2 chown --reference file1 file2


    43
    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".


    43
    ps awwfux | less -S
    ToyKeeper · 2009-07-04 09:39:28 4
  • Uses shell expansion to create a back-up called file.txt.bak


    43
    cp file.txt{,.bak}
    root · 2009-01-26 12:11:29 1
  • Change Seville for your prefered city. Show Sample Output


    42
    curl wttr.in/seville
    nordri · 2016-08-28 09:43:38 9

  • 42
    timeout 5s COMMAND
    kev · 2011-11-19 06:14:33 2
  • Directly attach a remote screen session (saves a useless parent bash process)


    42
    ssh -t remote_host screen -r
    recursiverse · 2009-07-23 06:15:04 7

  • 41
    tar -tf <file.tar.gz> | xargs rm -r
    prayer · 2009-07-06 22:23:11 3
  • 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
  • RTFMFTW.


    40
    rtfm() { help [email protected] || man [email protected] || $BROWSER "http://www.google.com/[email protected]"; }
    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.


    40
    script -qf | tee >(nc -kl 5000) >(nc -kl 5001) >(nc -kl 5002)
    clvv · 2010-10-11 07:55:30 12
  • 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.


    39
    diff <(lsof -p 1234) <(sleep 10; lsof -p 1234)
    zlemini · 2010-03-15 22:55:32 1
  • 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

  • 38
    until !!; do :; done
    unixmonkey21806 · 2013-05-14 18:08:54 3
  • Short command, easy to remember


    38
    curl ifconfig.me
    CodSpirit · 2010-08-01 13:56:01 0
  • 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
  • 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
  • -d: list directory entries instead of contents, and do not dereference symbolic links


    38
    ls -d */
    brianmuckian · 2009-10-08 22:07:22 2
  • Sometimes you need to use a port that is already opened by some program , and you don't know who to "kill" for it to release - so, now you do ! Show Sample Output


    38
    lsof -i tcp:80
    ar_levi · 2009-04-16 14:51:53 7
  • 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* [email protected]:[email protected]: autodetach on zombie kr verbose on multiuser on


    38
    % screen -r someuser/
    totoro · 2009-03-25 23:59:38 1
  • 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 [email protected] date)"
    splante · 2011-08-30 20:03:06 3
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Backup entire directory using rsync

This command can be used to extract the IP address of the network.
can be used within a script to configure iptables for example: iface=$2 inet_ip=`ifconfig "$iface" | grep inet | cut -d: -f2 | cut -d ' ' -f1` ipt="sudo /sbin/iptables" ......................... ---------------------------------------------------------------------------------------------------------------- $ipt -A INPUT -i $iface ! -f -p tcp -s $UL -d $inet_ip --sport 1023: --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT ---------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------- $ipt -A OUTPUT -o $iface -p tcp -s $inet_ip -d $UL --sport 3306 --dport 1023: -m state --state ESTABLISHED,RELATED -j ACCEPT -----------------------------------------------------------------------------------------------------------------

SSH connection through host in the middle

phpdoc shortcut
A shortcut to generate documentation with phpdoc. Defaults to HTML; optionally to PDF if third argument is given. Stores documentation in cwd under ./docs/. I forget the syntax to the output, -o, option, so this is easier.

Happy Days
AFAIR this is the wording ;)

Bruteforce dm-crypt using shell expansion
Lost your luks passphrase? You can always bruteforce from the command line. See the sample output, a simple command for the "pass" word, using combinations of upper/lowercase or number replacement. The generated combinations are: for a in {p,P}{a,A,4}{s,S,5}{s,S,5}; do echo $a; done pass pasS pas5 paSs paSS paS5 ...

Remove security limitations from PDF documents using ghostscript (for Windows)
#4345 also works under windows

Enable ** to expand files recursively (>=bash-4.0)
Since bash 4.0, you can use ** to recursively expand to all files in the current directory. This behaviour is disabled by default, this command enables it (you'd best put it in your .profile). See the sample output for clarification. In my opinion this is much better than creating hacks with find and xargs when you want to pass files to an application.

Cap apt-get download speed
apt-get is pretty aggressive when it downloads, potentially hogging the bandwidth of your network. The 25 is in KB, change this to your needs.

Calculate N!


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