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software:linux

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software:linux [2015/10/05 10:34] – Michele Porellisoftware:linux [2024/05/20 21:40] (current) – [Useful commands] Michele Porelli
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   * [[http://www.torino19.org/mike/pool/apt/fixgpgkeys|script]] to fix GPG keys errors   * [[http://www.torino19.org/mike/pool/apt/fixgpgkeys|script]] to fix GPG keys errors
   * Manual remove of a package (last resort!!)   * Manual remove of a package (last resort!!)
-  - First try:<code>dpkg -P --force-all nagios-common</code> +  - The cleanest way to remove the package is:<code>dpkg -P --force-all nagios-common</code> 
-  - If still no joy:<code>List the package contents and take a note of this list+  - If the process fails:<code>List the package contents and take a note of this list
 $ dpkg -L nagios-common $ dpkg -L nagios-common
  
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 to finish up, remove all files you found previously with 'dpkg -L'</code> to finish up, remove all files you found previously with 'dpkg -L'</code>
   * [[http://snipplr.com/view/13856/remove-all-rc-files-as-listed-in-dpkg/| Remove remaining configuration of all packages uninstalled]]   * [[http://snipplr.com/view/13856/remove-all-rc-files-as-listed-in-dpkg/| Remove remaining configuration of all packages uninstalled]]
 +    * <code>apt list | grep 'residual-config'</code>
 +    * <code>sudo aptitude purge ~c</code>
   * [[http://www.linuxcertif.com/man/1/dlocate/|dlocate]] is a really useful software to find which installed package provide a file on your system   * [[http://www.linuxcertif.com/man/1/dlocate/|dlocate]] is a really useful software to find which installed package provide a file on your system
   * [[http://alioth.debian.org/projects/cruft/|cruft]] search for orphans files (not unpacked by dpkg)   * [[http://alioth.debian.org/projects/cruft/|cruft]] search for orphans files (not unpacked by dpkg)
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     nautilus -q     nautilus -q
     Alt-F2 -> nautilus</code>     Alt-F2 -> nautilus</code>
-  * Fix Debian annoying locales problems: [[http://codetheory.in/fixing-locale-warnings-notices-issues-on-linux-server-or-desktop/|1]], [[https://fruit.je/utf-8|2]], [[michele.porelli.eu/software:linux?do=edit&rev=1444040895|3]], [[http://www.linuxquestions.org/questions/blog/bittner-195120/remove-unwanted-locales-on-ubuntu-debian-3281/|4]]+  * Fix Debian annoying locales problems: [[http://codetheory.in/fixing-locale-warnings-notices-issues-on-linux-server-or-desktop/|1]], [[https://fruit.je/utf-8|2]], [[http://perlgeek.de/en/article/set-up-a-clean-utf8-environment|3]], [[http://www.linuxquestions.org/questions/blog/bittner-195120/remove-unwanted-locales-on-ubuntu-debian-3281/|4]]
   * Configure PulseAudio: (NOTE: Wheezy is pulseaudio ready, this guide is Debian >=6.x only)   * Configure PulseAudio: (NOTE: Wheezy is pulseaudio ready, this guide is Debian >=6.x only)
     - INSTALL PULSEAUDIO<code># aptitude install pulseaudio pulseaudio-module-gconf     - INSTALL PULSEAUDIO<code># aptitude install pulseaudio pulseaudio-module-gconf
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 search "ao=alsa" and replace it with "ao=pulse"</code> search "ao=alsa" and replace it with "ao=pulse"</code>
   * To automatically mount NFS shares at boot time put in /etc/default/rcS<code>ASYNCMOUNTNFS="no"</code>   * To automatically mount NFS shares at boot time put in /etc/default/rcS<code>ASYNCMOUNTNFS="no"</code>
 +  * [[https://openzfs.github.io/openzfs-docs/Getting%20Started/Debian/Debian%20Buster%20Root%20on%20ZFS.html|Install Debian Buster using ZFS as RootFS]]. If you face problems with the rootfs not being found, you may want to increase the sleep time in initrd [[https://forum.proxmox.com/threads/failed-to-import-rpool-on-bootup-after-system-update.37884/post-273229|as described here]].
 ===== Kernel related ===== ===== Kernel related =====
   * [[http://www.makelinux.net/kernel_map/|Interactive kernel map]]   * [[http://www.makelinux.net/kernel_map/|Interactive kernel map]]
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 <code>sudo dnsmasq -i eth0 -d --dhcp-range=192.168.89.90,192.168.89.100</code> <code>sudo dnsmasq -i eth0 -d --dhcp-range=192.168.89.90,192.168.89.100</code>
 ==== Quick HTTP server ==== ==== Quick HTTP server ====
-<code>python -m SimpleHTTPServer 8000</code>+<code>python -m SimpleHTTPServer 8000 
 +python3 -m http.server 8080</code> 
 + 
 +==== Quick FTP server ==== 
 +<code>python -m pyftpdlib -p 2121</code>
 ===== Useful commands ===== ===== Useful commands =====
   * [[http://www.webupd8.org/2009/06/16-top-like-linux-apps-commands.html|List of 16 top-like commands]] to monitor network/system/hdd/ecc...   * [[http://www.webupd8.org/2009/06/16-top-like-linux-apps-commands.html|List of 16 top-like commands]] to monitor network/system/hdd/ecc...
   * [[http://ubuntuforums.org/showthread.php?t=869801&page=2|Change UUID of a NTFS partition]]   * [[http://ubuntuforums.org/showthread.php?t=869801&page=2|Change UUID of a NTFS partition]]
   * [[http://linuxaria.com/howto/7-hidden-features-of-bash?lang=it#|7 bash <del>hidden</del> not well known features]] - (Available only in Italian)   * [[http://linuxaria.com/howto/7-hidden-features-of-bash?lang=it#|7 bash <del>hidden</del> not well known features]] - (Available only in Italian)
 +  * [[http://man7.org/linux/man-pages/man1/fallocate.1.html|fallocate - preallocate or deallocate space to a file (Immediately!)]]
   * Scheduled shutdown/hibernate<code># shutdown -h +X     # X = minutes to wait before shutdown   * Scheduled shutdown/hibernate<code># shutdown -h +X     # X = minutes to wait before shutdown
 # shutdown -h 23:20     # 23:20 = hh.mm, system wait until system clock is 22.30 then shutdown # shutdown -h 23:20     # 23:20 = hh.mm, system wait until system clock is 22.30 then shutdown
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 # sleep X ; dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Suspend # sleep X ; dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Suspend
 method return sender=:1.22 -> dest=:1.125 reply_serial=2     # X = minutes to wait before hibernate</code> method return sender=:1.22 -> dest=:1.125 reply_serial=2     # X = minutes to wait before hibernate</code>
 +  * Wait for PID to complete:<code>tail --pid=${PID} -f /dev/null</code>
 ===== How-Tos ===== ===== How-Tos =====
 ==== External ==== ==== External ====
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   - Connect to server<code>$ ssh user@ip_server -L 1900:ip_vm:1900</code>   - Connect to server<code>$ ssh user@ip_server -L 1900:ip_vm:1900</code>
   - Then connect to your VM<code>$ ssh user@ip_vm</code>   - Then connect to your VM<code>$ ssh user@ip_vm</code>
-  - Start the listener<code>$ tar zc * | nc -l 190</code>+  - Start the listener<code>$ tar zc * | nc -l 1900</code>
   - Open a new terminal and start the receiver<code>nc localhost 1900 | tar zx</code>   - Open a new terminal and start the receiver<code>nc localhost 1900 | tar zx</code>
  
 +==== Copy a big amount of data as fast as possible ====
 +  * <code>tar cpf - . | pv | (cd /dst; tar xf -)</code>
 +==== Add a disk to extend a LVM logical volume ====
 +  - Mark your disk/partition as LVM<code># pvcreate /dev/sdX</code>
 +  - Extend the VolumeGroup containing your logical volume<code># vgextend VolGroup00 /dev/sdX</code>
 +  - Extend the logical volume<code># lvextend -l +100%FREE /dev/VolGroup00/LogVol02</code>
 +  - Extend the filesystem<code># resize2fs /dev/VolGroup00/LogVol02</code>
software/linux.1444041274.txt · Last modified: (external edit)