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--- linux [2019-03-08] – created hanez
+++ linux [2025-03-18] (current) – ↷ Page moved from user:hanez:linux to linux hanez
@@ Line 1: / Line 1: @@
-Linux
+====== 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>