Lect 1

• In man cmd i must select the section I search for the cmd in it by → man -s [section number] [cmd] , cause if there is more than one cmd or filename with the same name it will pick the first one .

• man -a [cmd] → list all matches

• man –k keyword

  Shows the commands that have manual pages that contains any of the

  given keywords

• • • help , whatis , info → get information about cmds

• pwd → printing working directory

Paths → absolute , relative

• relative → I stand in the place I want to deal with : if i have dir1 → mkdir dir1/dir3 → dir3 created in dir1
• abs → writing the path from the root
• . . / → stepbacke once
• ls -R → list all the tree
• cd alone OR cd ~ [user] → go to the home directory
• cd . . → stepback one directory
• cd - → go to the previous dir (back)
• to create a hidden file make the first letter ( . ) → touch .file ,and to list them → ls -a → list all

ls -F → mark the dirs by putting / after thier names

• there is no extention in Linux
• • at the end of file name means this file is executable (exe)