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--- linux [2019/03/08 22:32]
hanez created
+++ linux [2019/03/08 22:33] (current)
hanez
@@ Line 1: / Line 1: @@
-Linux
+====== Linux Stuff ======
+===== 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>
+==== Clean unused deps in Arch Linux ====
+<code>yaourt -Rsn $(yaourt -Qdtq)</code>
+==== Install local pkg.tar in Arch Linux ====
+<code>pacman -U .pkg.tar.gz or .pkg.tar.xz</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>

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