Linux File System Permissions and Advanced Commands For DevOps

Linux File Permission

Linux file permissions use rwx triplets to control read, write, and execute access for the file owner, group, and all users, settable with chmod.

Types of File Permissions:

• r (read): View file contents.

• w (write): Modify the file.

• x (execute): Allow or deny file execution.

Types of Permissions Groups:

• User: File owner's read, write, execute access.

• Group: Associated groups read, write, and execute access.

• Other: All other users' read, write, and execute access.

File Permissions Commands:

1. How to check the number of users?

   

2. How to add a user?

   

   

3. How to add a group?

   

4. How to check the number of groups?

   

5. How to add a user to any group?

   

6. How to change a group of any file?

   

7. How to change the permission of any file?

   

8. How to change the ownership of files and directories?

   

Other Important Commands:

1. scp

   The 'scp' command in Linux is used for securely copying files between a local host and a remote host or between two remote hosts.

   Local Host

   

   Remote Host

   

2. ssh

   The 'ssh' command allows secure access to remote systems over an encrypted connection.

   

3. grep

   The 'grep' command is used for searching and manipulating text.

   Basic Text Search

   

   Case-Insensitive Search

   

   Display Line Numbers

   

   Count Matching Lines

   

   Search for Whole Words

   

   Search for lines containing the word and save it to another file

   

4. awk

   The 'awk' command is used for pattern scanning, text extraction, reporting, and data analysis. It operates line by line, applying specified patterns and performing actions based on those patterns.

   Print Specific Columns from a File

   

   Conditional Printing

   

   Pattern Matching

   

   Field Separator

   

5. find

   The 'find' command is used for locating files and directories based on various conditions.

   

Happy learning (^_^)