Linux has become extremely easy to
administer. And can be administered using GUI
applications or using the Command line Interface (CLI)
As a professional Linux administrator,
you’ll have to know how to administer the OS via the CLI
Linux supports multi-tasking, several
users using the OS simultaneously.
By default 7 users can work
simultaneously (without anyone logging out). 6 Commandline users and 1 GUI user. To switch use CTRL
+ ALT + F1 (F2,F3,F4,F5,F6,F7) . CTRL+ALT+F7 takes you to the GUI one
From the GUI, you can always access the command line via
“Terminal”
Below are very useful command line tips
Ctrl + A to
mover the cursor to the beginning of command line
Ctrl + C to
end a running program and return the prompt
Ctrl + D to
log out of the current shell session, same as exit or logout
Ctrl + E to
move cursor to the end of the command line
Ctrl + H to
generate backspace character
Ctrl + L to
clear the terminal
Ctrl + R to
search command history
Ctrl + Z to
suspend a program
Shift + PageUp
or PageDown to
scroll (browse buffer)
Tab to autocomplete command of filename
Tab Tab to show command completion possibilities
If you can’t remember a command but
remember the first 2 or more letters, type them and press Tab
twice. This will list all the commands that start with those letters.
If you can’t remember how to use a
particular command, type man command e.g.
man mkdir to
read a comprehensive help file on using the command, mkdir.
If you need a quick help with using the
options or syntax of a command, type command --help
(double hypen).
e.g. mkdir
--help to get a quick help guide.
To get an easy to read manual (easier
than man) on any command, type info command e.g.
info mkdir
To get a short description of what a
command does, type whatis command e.g.
whatis mkdir
To get a list of commands for doing a
particular task, type apropos task e.g. apropos text to get text
manipulation commands/applications
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