What are the main elements you managed in Linux?

I administered the following elements in Linux:

• User and Group Management:

  • Creating, modifying, deleting users and groups.
  • Managing file and directory permissions (owner, group, others, rwx rights).
  • Configuring sudo.

• File System:

  • Navigating and working with files and directories (cd, ls, cp, mv, rm).
  • Managing disk space (df, du).
  • Mounting and unmounting file systems.
  • Managing logical volumes (LVM).

• Process Management:

  • Viewing running processes (ps, top).
  • Terminating processes (kill, killall).
  • Managing process priorities (nice, renice).

• Network:

  • Configuring network interfaces.
  • Managing routing.
  • Configuring DNS.
  • Working with firewalls (iptables, firewalld).
  • Monitoring network activity (netstat).

• Package Management:

  • Installing, updating, removing packages (apt, yum, dnf).
  • Working with repositories.

• Logging:

  • Viewing and analyzing logs (journalctl, grep).
  • Configuring log rotation (logrotate).

• Initialization System (systemd):

  • Managing service and process units.
  • Configuring autostart for services.

• Task Scheduling (cron):

  • Creating and managing cron jobs.

• Security:

  • Configuring SSH.
  • Managing SELinux/AppArmor.
  • Conducting system audits.

Practical example of user and group management:

# Create a user "devuser" with a home directory
useradd -m devuser

# Set a password for the user "devuser"
passwd devuser

# Create a group "developers"
groupadd developers

# Add user "devuser" to the group "developers"
usermod -aG developers devuser

# View groups of user "devuser"
groups devuser