# Arch Linux Cheat Sheet

## AUR / Aura / Makepkg

Alternative Build Directory:

```zsh
export BUILDDIR=/var/cache/makepkg-local
sudo --preserve-env=BUILDDIR aura -Axac proton --build $BUILDDIR
```

GPG Keys für AUR müssen im User-GPG eingefügt werden, nicht im Root GPG:

```sh
gpg --recv-key B94556F81C85D0D5
```

## SSD Trim + DMCrypt

https://wiki.archlinux.org/title/Dm-crypt/Specialties#Discard/TRIM_support_for_solid_state_drives\_(SSD)

## Online resize Crypt+LVM Disk

```zsh
# Expand the disc in ESXi
# Rescan SCSI to see expanded disk
echo "1" > /sys/class/block/sdb/device/rescan
# Check if everything went well
fdisk -l /dev/xyz
# if it didn't, you might have to reboot
cryptsetup status crypted
# Expand the LUKS partition and verify size 
cryptsetup status crypted
cryptsetup resize crypted
cryptsetup status crypted
# Resize the LVM PV, check
pvresize /dev/mapper/crypted
pvsdisplay
# Now allocate space to the volume
lvresize -L+750g /dev/isp/owncloud
lvs
# And resize the fs
resize2fs /dev/mapper/isp-owncloud
df -h
```

### References

- https://www.versedaily.net/how-can-i-rescan-hardware-on-linux/
- https://unix.stackexchange.com/questions/320957/extend-a-luks-encrypted-partition-to-fill-disk

## User Management

[UNIX / Linux : How to lock or disable an user account](https://www.thegeekdiary.com/unix-linux-how-to-lock-or-disable-an-user-account/)

To lock a users account use the command **usermod -L** or **passwd -l**. Both the commands adds an exclamation mark **(“!”)** in the second field of the file **/etc/passwd**. For example :

```
# usermod -L testuser
```

or

```
# passwd -l testuser
```

**Check if the user account is locked.** Check for the flag ***LK*** in the below command output which indicates that the account is locked.

```
# passwd --status root
root ***LK*** 2017-07-19 0 45 7 -1 (Password set, SHA512 crypt.)
```

## Alle AUR Python Pakete reinstallieren (Python Version Update)

```bash
aura -A $(pacman -Qqm | xargs -I {} pacman -Ql {} | grep "/usr/lib/python3.12/site-packages" | cut -d'/' -f1)
```