Quickhacks

Useful one-liners to do things faster, or blocks of code to facilitate more complex operations.

Update each docker compose service nested in a directory

find $MY_DOCKER_DIRECTORY -mindepth 1 -maxdepth 1 -type d -exec bash -c "cd '{}' && docker-compose pull && docker-compose up -d" \; && docker image prune -f

Change $MY_DOCKER_DIRECTORY with your own path. Example directory:

/My/Docker/Directory/
├── Jellyfin/
│   └── docker-compose.yml
|   └── ...
├── Dashy/
│   └── docker-compose.yml
|   └── ...
└── Pi-hole/
    └── docker-compose.yml
    └── ...

How it works

Suppose you have multiple docker-compose services inside $MY_DOCKER_DIRECTORY like in the tree structure above.

The command above will go inside each sub-folder (cd '{}'), pull the latest images available (docker compose pull) and update the services (docker compose up -d) .
Once every service has been updated, it will remove old images (docker image prune -f) to free up space.

Notes

This command will go and execute inside every sub-folder in $MY_DOCKER_DIRECTORY so make sure that each one of them has a docker-compose.yml file in it.

Copy multiple files from a remote ssh server

scp -r USER@REMOTE_IP:/remote/path/* /local/path

Change:

USER with the user on the remote machine
REMOTE_IP with the IP of the remote machine
/remote/path/ with the path containing the files on the remote machine
/local/path with the path where you want to paste the files on the local machine

How it works

Pretty self-explanatory. Copies files from inside the /remote/path/ directory on the server to the /local/path directory on your local machine.

Chroot properly to repair a Linux system

sudo mount /dev/sda3 /mnt
sudo mount /dev/sda1 /mnt/boot
cd /mnt
sudo mount -t proc proc proc/
sudo mount --rbind /sys sys/
sudo mount --rbind /dev dev/
sudo cp /etc/resolv.conf etc/resolv.conf

sudo chroot /mnt
# You can now proceed to fix your installation

Change:

/dev/sda3 with your system root partition
/dev/sda1 with your system boot partition

If in doubt, use lsblk -f to check your partitions.

When done, remember to exit and unmount every directory in reverse order using umount -f.

Why

Sometimes it happens that Grub breaks, network isn't working anymore, or you're having problems with initramfs/mkinitcpio.

Before you chroot in your linux partition to repair your installation, it's important to mount the necessary directories or else most of the fixes you'll try will most likely not work and give you errors.

The block of code above should give you access to everything you need to fix the problems just mentioned.

Notes

Tested on an Artix system.