Day - 9 of DevOps

ip addr show / ifconfig:

• ip addr show: Displays network interfaces and their IP addresses using the ip command.

• ifconfig: A legacy command used for similar purposes. Modern Linux systems often use ip instead.

  

route -n:

• Displays the routing table, showing the routes to different network destinations.

  

netstat -tulpn:

• Lists active network connections and listening sockets along with the associated processes using the netstat command.

  

nslookup / dig:

• nslookup: A command-line tool for querying Domain Name System (DNS) servers to obtain domain name or IP address information.

  

• dig: Another DNS query tool, providing more detailed information than nslookup.

  

ping / ping -i 5 google.com:

• ping: Sends ICMP echo requests to a network host to check its availability.

  

• ping -i 5 google.com: Sends ping requests to "google.com" every 5 seconds.

ctrl+z, ctrl+c, ctrl+d, ctrl+x:

• Keyboard shortcuts used in the terminal:

  • ctrl+z: Suspends the currently running process.

  • ctrl+c: Interrupts or terminates the currently running process.

  • ctrl+d: Signals the end-of-file.

  • ctrl+x: Varies by application; in some text editors, it might cut text.

ps -T, ps -aux, ps -ef - system all process:

• ps -T: Displays information about processes and their threads.

  

• ps -aux / ps -ef: Provides a detailed list of all processes, including user, CPU usage, and more.

  

fg:

• Brings a background process to the foreground. Useful after using ctrl+z to suspend a process.

  

sleep:

• Delays the execution of a script or command for a specified amount of time. Useful for creating delays in scripts.