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linux [2024-03-12] – removed - external edit (Unknown date) 127.0.0.1linux [2025-03-18] (current) – ↷ Page moved from user:hanez:linux to linux hanez
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 +====== Linux ======
  
 +<nspages user:hanez:linux -h1 -r -textPages="" -tree>
 +
 +  * [[https://www.cyberciti.biz/faq/howto-create-lage-files-with-dd-command/|Create empty large files]]
 +  * [[https://www.addictivetips.com/ubuntu-linux-tips/back-up-email-linux-imap-grab/|How To Back Up Email On Linux With IMAP Grab]]
 +
 +===== AMDGPU =====
 +
 +  * [[https://www.amd.com/de/support/kb/release-notes/amdgpu-installation|Radeon Software for Linux Installation]]
 +  * [[https://wiki.archlinux.org/index.php/AMDGPU|AMDGPU]]
 +  * [[https://wiki.archlinux.org/index.php/AMDGPU_PRO|AMDGPU PRO]]
 +  * [[https://math.dartmouth.edu/~sarunas/amdgpu.html|AMDGPU-PRO OpenCL with the open-source amdgpu kernel module]]
 +
 +===== Useful commands =====
 +
 +==== Start GUI program as different user: ====
 +
 +<code>xhost +SI:localuser:testuser
 +
 +su - testuser -c "export DISPLAY=:0.0 && firefox"</code>
 +
 +After exit you should disable acces by running:
 +
 +<code>xhost -SI:localuser:testuser</code>
 +
 +Everything in one command:
 +
 +<code>xhost +SI:localuser:testuser && su - testuser -c "export DISPLAY=:0.0 && firefox && exit" && xhost -SI:localuser:testuser</code>
 +
 +==== Howto create and mount encrypted disk ====
 +
 +=== Create: ===
 +
 +<code>cryptsetup luksFormat /dev/sdb1
 +cryptsetup luksOpen /dev/sdb1 crypto
 +mkfs.ext2 /dev/mapper/crypto</code>
 +
 +=== Mount: ===
 +
 +
 +<code>cryptsetup luksOpen /dev/sdb1 crypto
 +mount /dev/mapper/crypto /mnt/crypto</code>
 +
 +=== Unmount: ===
 +
 +
 +<code>umount /dev/mapper/crypto
 +cryptsetup luksClose /dev/mapper/crypto</code>
 +
 +=== Change Key: ===
 +
 +
 +In LUKS scheme, you have 8 "slots" for passwords or key files. First, check, which of them are used:
 +
 +<code>cryptsetup luksDump /dev/sdb1 | grep BLED</code>
 +
 +Then you can add, change or delete chosen keys:
 +
 +<code>cryptsetup luksAddKey /dev/sdb1 (/path/to/<additionalkeyfile>)</code>
 +
 +<code>cryptsetup luksChangeKey /dev/sdb1 -S 6</code>
 +
 +As for deleting keys, you have 2 options:
 +
 +a) delete any key that matches your entered password:
 +
 +<code>cryptsetup luksRemoveKey /dev/sdb1</code>
 +
 +b) delete a key in specified slot:
 +
 +<code>cryptsetup luksKillSlot /dev/sdb1 6</code>