BASIC COMMANDS SHOULD LEARN AS UNIX/LINUX ADMIN

ls : list the files
touch :- to create the file system.

cat :- to view the content of the file

vi :- to edit/add the content in file.

for examples

Below you can see how you can list the files,create file "redhat" and add content  as "this is redhat file " and how can you cat redhat file.

Please see below for some more ls commands with examples  :-

ls	List the  Files / directories
ls –a	List All files and directories including hidden Files
ls -l	List All information about files/directories
ls –ld	List Directory Information
ls -lt	List Last Modified Time Using
ls –r	List files with reverse order
ls –ltr	Order Files Based on Last Modified Time (In Reverse Order) Using
ls –R	List  Files Recursively Using
ls –lh	List  files in KB, MB, etc
ls –m	LIst  files with comma separation
ls –i	Display File inode Number Using
ls –q	Hide Control Characters Using
ls –n	Display File UID and GID Using

You may want to know

how to differentiate b/w file and Directory ?