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Basic Understanding :

Every Linux command have 3 parts :
notion image

cat abc.tx → 1st things is command (like below in image - cat) name 2nd things is option (-n) and (argument- which is file name below abc.txt).
notion image
Below are some basic commands in LINUX :
 
  1. Man
  1. list
  1. ls
  1. pwd
  1. cd
  1. ls and ls -a
  1. ls -l
  1. ls -a -l or ls -al
  1. ls -alh
  1. ls -alht → (Sort by the new time to old.)
  1. ls -alhtr → revers
  1. ls -l —sort=timen
  1. ls -l —sort=time -r
  1. cd .. & cd .
  1. cd / and cd ~
  1. mkdir