Introduction

The Linux command comm is a command line utility used to compare two files line by line. It is used to compare two sorted files and output a three column result showing the lines that are unique to each file, the lines that are common to both files, and the lines that are unique to the second file. This command is useful for finding differences between two files, such as configuration files, log files, or text files. It can also be used to compare two directories and find the differences between them.

Examples

1. ls: The ls command is used to list the contents of a directory.

Example: ls -l

2. cd: The cd command is used to change the current working directory.

Example: cd /home/user/Documents

3. mkdir: The mkdir command is used to create a new directory.

Example: mkdir my_new_directory

4. rm: The rm command is used to remove files or directories.

Example: rm my_file.txt

5. mv: The mv command is used to move or rename files or directories.

Example: mv my_file.txt my_new_file.txt

6. grep: The grep command is used to search for a pattern in a file or files.

Example: grep “error” my_log_file.log

7. chmod: The chmod command is used to change the permissions of a file or directory.

Example: chmod 755 my_file.txt

8. find: The find command is used to search for files or directories.

Example: find / -name my_file.txt

9. tar: The tar command is used to create or extract archives.

Example: tar -cvf my_archive.tar my_directory/

10. ssh: The ssh command is used to securely connect to a remote system.

Example: ssh user@hostname

Linux Command

Linux is an open-source operating system that is used by millions of people around the world. It is a powerful and versatile operating system that can be used for a variety of tasks, from web development to system administration. To use Linux, you need to know the basic Linux commands. These commands are used to perform various tasks, such as creating and managing files, running programs, and managing system resources.

Basic Linux Commands

The most basic Linux commands are used to navigate the file system. These commands include ls, cd, pwd, and mkdir. The ls command is used to list the contents of a directory, while the cd command is used to change the current working directory. The pwd command is used to print the current working directory, and the mkdir command is used to create a new directory.

Advanced Linux Commands

Advanced Linux commands are used to manage system resources, such as users, processes, and networks. These commands include useradd, ps, netstat, and iptables. The useradd command is used to add a new user to the system, while the ps command is used to view running processes. The netstat command is used to view network connections, and the iptables command is used to configure the firewall.

Conclusion

Linux commands are essential for anyone who wants to use the Linux operating system. Knowing the basic and advanced Linux commands will help you to manage your system more efficiently and effectively. With the right commands, you can easily perform tasks such as creating and managing files, running programs, and managing system resources.