Linux useful commands

linux-useful-commands.sh

#=====================================
# locale

locale-gen pt_BR pt_BR.UTF-8
dpkg-reconfigure locales

#=====================================
# timezone

# change non interactive
timedatectl set-timezone <timeszone>

# current timezone
cat /etc/timezone

# reconfiguring
dpkg-reconfigure --frontend noninteractive tzdata

# timezones list:
ls /usr/share/zoneinfo/*

#=====================================
# user and groups management

# change user id
usermod -u <id> <user>

# change group id
groupmod -g <id> <group>

#=====================================
# reset gnome panels
dconf reset -f /org/gnome/gnome-panel/

#=====================================
# editing files
find . -type f -exec sed -i 's/current/new/g' {} \;

#=====================================
# extracting files

# zip
gunzip filename.zip

# rar
unrar x filename.rar

# tar
tar -xvf filename.tar

# tar.gz
tar -vzxf filename.tar.gz

# bz2
bunzip filename.bz2

# tar.bz2
tar -jxvf filename.tar.bz2

#=====================================
# distro version

cat /etc/*-release
cat /proc/version
lsb_release -a

#=====================================
# troubleshooting

tcpdump -ni any host <ip-origem>

#=====================================
# manage docker as a non-root user
# ref: https://docs.docker.com/install/linux/linux-postinstall/
sudo groupadd docker
sudo usermod -aG docker $USER

#=====================================
# debian vim copy and paste
https://unix.stackexchange.com/questions/318824/vim-cutpaste-not-working-in-stretch-debian-9

#=====================================
# update-alternatives
sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 1
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.7 2

# refs:
# https://gist.github.com/kentblake/6910dd256f989abb41af30a8eeb01237
# https://gist.github.com/patrickmmartin/5b6b2ddecd29d6a1b2ffee2d8eea31ec
# https://linuxconfig.org/how-to-change-from-default-to-alternative-python-version-on-debian-linux