Linux usual command (Debian)

apt.sh

# Check for update
apt-get update

# Apply update
apt-get upgrade -y

# Install package
apt-get install package name

# List installed package
dpkg -l

interact.sh

# Display the command path
which cmd

# Display more revelant information about the commande location
whereis cmd

manage_user.sh

# Create user only
adduser

# Remove user only
deluser

# Create user and create home directory
useradd user_name

# Remove user with it home directory
userdel user_name

# Add user in specific groupe
adduser user_name sudo

# Kill user session
pkill -9 -u user_name

# Remove user from specific groupe
deluser user_name groupe_name

# Remove groupe
delgroup groupe_name

# Display groupe of the user 
groups user_name

# Display id of user
id user_name

# Set the default user shell (Make sur the shell is installed)
usermod -s /bin/bash user_name

# Set the default user home directory
usermod -d /path/to/home user_name

# display /etc/passwd informations and more... (ldap)
cat /etc/passwd
getent passwd

# display /etc/group informations and more... (ldap)
cat /etc/group
getent group

# display /etc/shadow informations and more... (ldap)
cat /etc/shadow
getent shadow

# change the current user password
passwd

# change specific user password
passwd user_name

package.sh

# Install utils
apt-get install \
  tree \
  tig \
  dos2unix
  
# Install c function man page
apt-get install \
  manpages-dev \
  manpages-posix-dev

system.sh

# Restart
reboot -h 0

# Show service status
service --status-all

# Start service
service service_name start

# Stop service
service service_name stop

# Restart service
service service_name restart

# Display partition
fdisk -l

# Display service state
service service_name status

# Follow logs
tail -f /var/log/log_file

# Display the current folder size
du -sh

# Display folder size
du -h ./

# Display volume
df -h

## Transforme CRLF file ending by LF
dos2unix file_name

# Transforme CRLF file ending by LF for all directory
find . -type f -print0 | xargs -0 dos2unix