2021-07-04 11:17:53 +00:00
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---
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author: Alvie Rahman
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date: \today
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2021-08-23 14:25:05 +00:00
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title: Linux
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2022-03-02 01:43:54 +00:00
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tags:
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- linux
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uuid: 8ef11516-4afd-4f80-abb8-bdce045e8b65
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2021-07-04 11:17:53 +00:00
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---
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# user stuff
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## add user to group
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```bash
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2021-09-01 14:55:07 +00:00
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usermod -a -G group user
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2021-07-04 11:17:53 +00:00
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```
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## change primary user group
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```bash
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2021-09-01 14:55:07 +00:00
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usermod -g group user
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2021-07-04 11:17:53 +00:00
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```
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2024-01-29 15:37:30 +00:00
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# help i think my device shut down after deleting the current kernel and before installing the second (no entries in systemd-boot/grub/<bootloader>)
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0. boot into a live usb of current disto
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1. mount the root partition to `/mnt` and the boot partition to the appropriate folder (check
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fstab which should be in `/mnt/etc/fstab`, if it says `/efi`, mount it to `/mnt/efi`)
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2. chroot into the mounted filesystem:
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on arch based systems you can simply run:
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```
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arch-chroot /mnt
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```
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on non arch based systems[^1]:
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```
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mount -t proc /proc /mnt/proc/
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mount -t sysfs /sys /mnt/ys/
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mount --rbind /dev /mnt/dev/
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# only if using uefi
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mount --rbind /sys/firmware/efi/efivars /mnt/sys/firmware/efi/efivars/
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# for internet access
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cp /etc/resolv.conf /mnt/etc/resolv.conf
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chroot /mnt /bin/bash
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```
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3. the system can now be force updated/kernel images can be generated
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on arch based systems[^2]:
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```
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# reinstall all current packages
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pacman -Qqen > /root/pkgs.txt # list all installed packages
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pacman -S $(< /root/pkgs.txt) # reinstall all installed packages
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rm /root/pkgs.txt # clean up
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# reinstall dependencies (if there are issues)
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pacman -Qqdn > /root/deps.txt # list all installed dependencies
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pacman -S $(< /root/deps.txt) # reinstall all installed dependencies
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rm /root/deps.txt # clean up
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```
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[^1]: https://wiki.archlinux.org/title/Chroot [wayback machine](https://web.archive.org/web/20240121115548/https://wiki.archlinux.org/title/Chroot)
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[^2]: https://bbs.archlinux.org/viewtopic.php?id=193174 [wayback machine](https://web.archive.org/web/20240129153400/https://bbs.archlinux.org/viewtopic.php?id=193174)
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