This document provides an overview and introduction to using UNIX and the bash shell. It covers connecting to a remote UNIX system using SSH, the anatomy of the command window, basic command structure and examples. It also discusses getting help, working with files and directories including wildcards and redirection, creating and editing files using redirection, pipes and the vim editor. The objectives are to familiarize users with basic UNIX commands, files/directories, and the vim editor.
Linux Administration in this basic commands are there & also advanced commands are also there,It will be very use full for everyone who are all intrested in learning Linux,Which means everyone learn Linux esaliy.
Linux Administration in this basic commands are there & also advanced commands are also there,It will be very use full for everyone who are all intrested in learning Linux,Which means everyone learn Linux esaliy.
This is a document useful for one who wants to learn the Basics of UNIX command.
Targeted for fresher to the industry and new learner of UNIX command for experienced professionals too.
Hope everyone will like it.
This is a document useful for one who wants to learn the Basics of UNIX command.
Targeted for fresher to the industry and new learner of UNIX command for experienced professionals too.
Hope everyone will like it.
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4. Connecting with ssh
Open a Terminal program
Mac: Applications > Utilities > Terminal
ssh –Y username@centos.css.udel.edu
Linux: In local shell
ssh –Y username@centos.css.udel.edu
Windows: Start Xming and PuTTY
Create a saved session for the remote host
name centos.css.udel.edu using username
15. Command Structure
command [arguments]
Commands are made up of the actual command and its
arguments.
command -options [arguments]
The arguments are further broken down into the command
options which are single letters prefixed by a “-” and other
arguments that identify data for the command.
18. Command Input Keys
Summary
return
delete
◀
A
▲
to insert a character.
to erase character to left.
to enter the command.
to move to the left or
right.
to retrieve previous
command.
At the cursor location use
◀
Tab for command line completion.
19. Command Input Keys
Summary
control C or CTRL-c or just C-c
use the control key as a shift
Control
C
Control D
control D or CTRL-d or just C-d
use the control key as a shift
Control U
control U or CTRL-u or just C-u
use the control key as a shift
20. Command Output
Summary
Lines longer then the column width
are wrapped.
Lines are scrolled off the top and the
prompt will appear at the bottom of
the screen.
Use the mouse in the resize handle to
increase the width of the screen and
unwrap the lines.
Use the mouse in the scroll bar to see
lines that have scrolled off the screen.
21. Getting Help
man command
man is a command that formats and displays on-line manual pages for
command.
info [subject]
info formats and displays online documents that are easily searchable.
apropos keyword
apropos searches the whatis database for commands containing the
keyword
24. Getting Help: Info Keys
H
L
delete
To read linearly through all sections
‘h’ special link to help.
back up after SPC
‘l’ return from help link.
Q ‘q’ to quit.
25. Getting Help: Info Keys
tab
L
return
Jump to next link or cross reference.
back up to previous link.
follow the link at the cursor.
‘l’ return from link.
Q ‘q’ to quit.
tab
esc
M ‘m’ to go to the menu.
27. Files and Directories
Files
Data in UNIX is stored in files.
Directories
Files are organized hierarchically into directories.
Top-level directory is called “root” represented as a slash
(/).
Every file (and directory) is listed and separated by a
slash (/).
28. Files and Directories
The UNIX file system is like an inverted
tree.
root
/
home/its/ug1/ee51vn/report.
39. Editing Files
The VIM editor has two modes:
1. Command: interprets a letter or sequence of letters as
a command.
2. Insert: puts anything typed into the file. The ESC key
ends insert mode and returns you to command mode.
Command line entry at the bottom of the screen
appears when the command “:” is typed. VIM starts up in
command mode.
42. Resources
Unix Tutorial for Beginners
http://info.ee.surrey.ac.uk/Teaching/Unix/
VTC (Unix Shell Fundamentals) – need to request an account
http://www.udel.edu/it/learnit/course/vtccom.html
VIM Tutor (vimtutor)
Linux vi and vim editor: Tutorial and advanced features
http://www.yolinux.com/TUTORIALS/LinuxTutorialAdva
nced_vi.html
Graphical vi-vim Cheat Sheet and Tutorial
http://www.viemu.com/a_vi_vim_graphical_cheat_sheet
_tutorial.html