BASH Features
BASH: Bourne again shell
when you login to the Server using any CLI based tool OR login to the CLI mode you can see as like below screen.$ sign = local user/non-privilege user
# sign = Administrator/Privileged user
[root@sankar ~]#
Shells can be changed based the user compatibility and requirements, most of default shell is 'BASH'
[root@sankar ~]# cat /etc/shells
/bin/sh
/bin/bash
/sbin/nologin
/bin/tcsh
/bin/csh
/bin/dash
You have new mail in /var/spool/mail/root
[root@sankar ~]#
Command Line Completion:
Single
Tab – it will provide the best option
Double
Tab – it will provide all the possible options (Autocompletes)
Command Line Editing:
Ctrl+a - It
moves cursor to the Home line position
Ctrl+b - Moves
the cursor back one character
Ctrl+c - Sends
the signal SIGINT to the current task, which aborts and close it.
Ctrl+d - Close
current shell prompt
Ctrl+e - It
will move a cursor to end of the bash
Ctrl+f - Moves
cursor forward one character
Ctrl+g - Abort
the research and restore the original file
Ctrl+h - Deletes
the previous character (Same as backspace)
Ctrl+k - It
is used to delete the command from the courser to line home position
Ctrl+l - Clear
the screen
Ctrl+u - Clears
the line content before the cursor and copies it into the clipboard
Ctrl+y - Yank
the content from the cursor position
Ctrl+z - Sends
the signal SIGTSTP to the current task, which suspend it
Ctrl+Shift+c - Copy
selected text
Ctrl+Shift+v - Paste
the copied content
Ctrl+Shift+t - Tab
Ctrl+Shift+n - New
Terminal
Ctrl+Shift+w -
Close Tab
Ctrl+Shfift+q - Close
a Terminal
Alt+b - Moves
the cursor backward one word
Alt+c - Capitalizes
the character under the cursor and moves to the end of word
Alt+d - Cut
the word after the cursor
Alt+f - Moves
the cursor forward one word
Alt+l - Lowers
the case of every character from the cursor’s position to the end
Alt+. - Insert
the last argument to the previous command
Command Line History: Command line history will be saved, when you execute any command in terminal.
$ history - this
command will display all the previous executed commands
$ history
–c - Clear
the command history
$
!<number> - it executes
mentioned number command
Note: Default history size is 1000 commands[root@sankar ~]# history
$
!<charectar> - it will display/execute matching
character command
$ !! - it will execute last executed command
Sophisticated prompt control:
? - It
will replace a single character
Example: rm –rf a? - it will delete the files with two
characters
Rm –rf a?? - it
will delete the three characters files after “a”
* - replace
multiple number of characters
Example: rm –f a* - it will remove all the files which are starting with “a”
Piping and Redirecting:
Redirecting input and output from standard stream to user
defined place
1.
Input RD -0 <
2. Output RD -1
Values > Symbols
3. Error RD -2 >
Example: $ sort < <file name>
$ wc < <file
name>
$ history > f2
$mkdir d1 2> e1
Piping sending output or one command as a input to the another command
| pipe
 |
| pipe Symbol |
Page
related command:
Less:
is used to see the command output page by page in up and down way
More: we can’t
go upward downward, just see the output fit to the screen
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