Access Linux File System in RHEL - RHCSA (RH124).pdf

Slides on how to access linux file system - Part of RHCSA (RH124) syllabus

1. Access Linux File System

2. Linux
●Open-source
●Unix-like OS kernel
●Started by Linus Torvalds in 1991 as a
personal project
●Global developer collaboration led to
widespread adoption

Tux
●Official mascot created by Larry Ewing
●Represents coolness and stability
Source:https://greencloudvps.com/linux-distributions-e
verything-you-need-to-know.php

3. Features of Linux
Source: Features of Linux Operating System - Naukri Code 360

4. Basic linux commands
●whoami
●man
●—help
●whatis
●pwd
●mkdir
●cd
●fdisk -l
●less



●more
●head
●tail
●echo
●sed
●awk
●which
●stat
●history

5. Get current user name
●Command: whoami


Display manual pages for a command
●Command: man <command>

6. Get information on a command's usage, options, and syntax.
●Command: <command> – – help






Get a one-line description of any command
●Command: whatis <command>

7. Get current directory path
●Command: pwd



Create a directory and then verify it using ‘ls’ command
●Command: mkdir <directory-name>

8. To change the current working directory
●Command: cd <directory-name>
Change directory to parent directory
●Command: cd ..

9. Stay in current directory
●Command: cd .


Change directory to home directory
●Command: cd ~

10. List all the disk partitions
●Command: fdisk -l

11. View the content, one page at a time
●Command: less </path/to/file>

12. View content of a file one screen at a time
●Command: more <file-name>

13. Head:
●Used to display starting lines of a file
●By default it shows the first 10 lines
●-n option specifies how many lines to display
●Command: head -n 5 <file-name>

14. Tail:
●Displays last lines of file
●By default shows last 10 lines of file
●-n option specifies how many lines to display
●-f option can be used to keep tail command running and display new
lines as they are appended to the file
●Command: tail -n 5 <file-name>

15. echo:
●Used to print text to terminal
●Command: echo <text>



●‘>’ redirects output into a file
●Takes output from echo (left) and redirects it to myfile.txt (right)
●Command: echo 'This is a sample text' > <file-name>

16. Find and replace text within a file
●Command: sed -i 's/{old_text}/{new_text}/' <file-name>

17. awk:
●Text processing tool
●Used for pattern scanning and processing in files or streams
●-F option allows setting a custom field delimiter with whitespace as
the default
●Transform files and produce formatted output lines
●Command: awk -F: '{print $1}' <file-name>

18. Find the full path of the bash shell
●Command: which bash


List previously executed commands in the current session.
●Command: history

19. Display detailed information about the file: file name , permissions and
timestamps

●Command: stat <file-name>