#+TITLE: Unix Commands

* Navigation
- =pwd= Print Working Directory
- =ls= List Segments: list files
    - =-a= All - show hidden files
    - =-l= Long
    - =-t= Time - in order of modification time
- =cd= Change Directory
- =mkdir= Make Directory

* Manipulation
- =cp= : copies files
- =mv= : moves and rename files
- =rm= : remove files
- =rm -r= : remove directories (-r : Recursive)

* Redirection
- =>= : redirects output of a command to a file, overwriting previous content
- =>>= : redirects output of a command to a file, appending new content to previous content
- =<= : redirects standard input to a command
- =|= : redirects standard output of a command to another command
- =sort= : sort lines of text alphabetically
- =uniq= : filters duplicate, adjacent lines of text
- =grep= : searches for a text pattern and outputs it
- =sed= : searches for a text pattern, modifies it, and outputs it

* Environnement
- =~= (alt+n) : user’s home directory
- =nano= : line text editor
-  =\.bash_profile= : is where environment settings are stored
    - ~export VARIABLE='Value'~
    - =USER= : the name of the current user
    - =HOME= : home directory (not to customize)
    - =env= : return a list of environment variables

* Grep
=grep texte nomfichier=
- =-i= : ne pas tenir compte de la casse (majuscules / minuscules)
- =-n= : connaître les numéros des lignes
- =-v= : inverser la recherche : ignorer un mot
- =-r= : rechercher dans tous les fichiers et sous-dossiers