Łukasz Wieczorek's blog A slice of programmer's life

Random findings

04 May 2017

Secure GPG key generation using gpg:

gpg2 --gen-key
gpg2 --list-keys
gpg2 -K --keyid-format long --with-colons --with-fingerprint
gpg2 --export -a $ID

Other useful GPG commands;

gpg2 --delete-secret-key $email
gpg2 --delete-key $email
gpg --armor --export $email > "${email}.asc"

Long ssh key generation using ssh-keygen:

ssh-keygen -b 16384

Setting fedora docker directories permission using chcon:

sudo chcon -Rt svirt_sandbox_file_t /var/lib/docker/volumes/
chcon -Rt svirt_sandbox_file_t $volume_dir

Burning Ubuntu to USB using dd:

lsblk -f
umount /dev/sdb1
dd if=ubuntu-16.04.2-desktop-amd64.iso of=/dev/sdb bs=4M status=progress
sync

Ignoring changes for file in git:

git update-index --(no-)assume-unchanged

Removing project containers using docker-compse:

docker-compose down --rmi all --remove-orphans

Rebuilding project containers using docker-compose:

docker-compose up --build

Updating all globally installed gems using gem and cut:

sudo gem update `gem list | cut -d ' ' -f 1`

Upgrading to Fedora 26 using system-upgrade:

dnf upgrade --refresh
dnf install --assumeyes dnf-plugin-system-upgrade
dnf system-upgrade download --refresh --releasever=26
dnf system-upgrade reboot

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