Commands by UnixNeko (4)

  • Check if a machine is online

    PING parameters c 1 limits to 1 pinging attempt q makes the command quiet (or silent mode) /dev/null 2>&1 is to remove the display && echo ONLINE is executed if previous command is successful (return value 0) || echo OFFLINE is executed otherwise (return value of 1 if unreachable or 2 if you're offline yourself). I personally use this command as an alias with a predefined machine name but there are at least 2 improvements that may be done. Asking for the machine name or IP Escaping the output so that it displays ONLINE in green and OFFLINE in red (for instance).


    9
    ping -c 1 -q MACHINE_IP_OR_NAME >/dev/null 2>&1 && echo ONLINE || echo OFFLINE
    UnixNeko · 2012-02-09 06:30:55 33
  • Extract a .gz file with privilege

    Extracting .gz files and placing the output in another directory in one command line is convenient thing. I just followed some how-to to install Nagios on Ubuntu Lucid Lynx but they give the method to install from archives. I wished to install from the repository. If you do so some files are missing. I've not tested yet but this is an example command line I did to extract sudo sh -c 'gunzip -c /usr/share/doc/nagios3-common/examples/template-object/templates.cfg.gz > /etc/nagios3/objects/templates.cfg' We need privilege to write the destination file. Show Sample Output


    0
    sudo sh -c 'gunzip -c source.gz > destination'
    UnixNeko · 2011-07-05 23:51:01 5
  • Rip CD

    Can be useful to rip a CD. Show Sample Output


    -1
    ripit -c 0 --outputdir $1 --nosubmission
    UnixNeko · 2011-06-12 12:29:26 4
  • Reload gnome-panel

    I have some problems with gnome panel which does not load completely leaving me without the actual GUI. This commands helps to kill the gnome-panel process then it should be relaunch automatically.


    -2
    pgrep -lf gnome-panel | awk '{if ($2=="gnome-panel") print $1}' | xargs kill -9
    UnixNeko · 2011-06-12 12:23:27 16

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grab all commandlinefu shell functions into a single file, suitable for sourcing.
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Change directory (cd) to the directory where all your encrypted files are placed, and then run the command - then you are asked to insert your secret gpg password - ubuntu 8.04

Get http headers for an url

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There's no need to be logged in facebook. I could do more JSON filtering but you get the idea... Replace u=4 (Mark Zuckerberg, Facebook creator) with desired uid. Hidden or not hidden... Scary, don't you?

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

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"

Mount partition from image (without offset mount)

Print out your hard drive to a jet-direct compatible printer.
Where 192.168.1.2 is a printer with jet-direct. No, I don't suggest this as a backup method.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

tail: watch a filelog
-f file(s) to be monitorized -n number of last line to be printed on the screen in this example, the content of two files are displayed

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