Search result for 'Linux'

This is a command to check the processes in the Linux host.

• Command: sudo chown root:root /swapfile
• Note: (Optional, as root is the default owner)

• Command: sudo chmod 600 /swapfile
• Ensures only the root user can read and write to the swap file, enhancing security.

• Command: sudo swapon /swapfile
• Purpose: Activates the swap file for use by the system.

• Command: swapon --show
• Purpose: Lists active swap files and partitions.

• Command: sudo mkswap /swapfile
• Purpose: Prepares the file to be used as swap.

Purpose: Adds an entry for the swap file to the Filesystem Table (/etc/fstab), ensuring it's activated at boot.

• Objective: Verify that the command is installed on the system.
• Commands:

1. Debian/Ubuntu: dpkg -l | grep command_name
2. Red Hat/CentOS/Fedora: rpm -q command_name
3. Generic: command -v command_name || echo "Command not found"

• Objective: Check for missing libraries or dependencies required by the command.
• Command:

1. Check dynamic dependencies: ldd $(which command_name)

• Note: While looking for dynamic dependencies, Look for missing files or "not found" entries.

• Objective: Confirm that the user has the necessary execution permissions.
• Commands:

1. View permissions: ls -l $(which command_name) or for a script: ls -l /path/to/script
2. If necessary, modify permissions: sudo chmod +x /path/to/script

• Objective: For system commands requiring root access, ensure the user has sudo permissions.
• Commands:

1. Attempt execution with sudo: sudo command_name
2. Check sudo privileges: sudo -l

• Objective: Ensure the command exists and is accessible to the user.
• Commands:

1. Check if the command is available: which command_name or type command_name
2. If the command is a script, verify its path: ls -l /path/to/script

If necessary, modify permissions to give the execution permissions

• Purpose: Quickly assess system status post-reboot.
• Command:

1. uptime# Check system uptime.
2. dmesg | tail -50# Review last 50 kernel messages.
3. journalctl -xb -p 3# Examine system journal for error messages on current boot.