Linux Common commands Summary (Pwd,echo,history,nano)

1. pwd : Outputs the current working directory

command format: pwd [OPTION] ...

Example: [email protected] etc]# pwd

/etc

2. Echo: echo text

Command format:

echo [Short-option] ... [STRING] ...

Echo long-option

Options: - N No line break after output text

[[email protected] ~]# echo ' hello! '

Hello!

[[email protected] ~]# echo-n ' Hello '

Hello[[email protected] ~]#

- e turn on the translation escape character (the following characters are encountered for special processing)

\a : Alert Sound

\b : Delete the previous character

\c : Finally, no newline characters are added.

\f : line break But the cursor is still in its original position

\ n : The newline cursor moves to the beginning of the line

\ r : The cursor moves to the beginning of the line, but does not wrap

\ t : Insert a Tab

                 \\ : Inserting \ character

[Email protected] ~]# echo-e ' Hel\tlo '

Hel lo- à The result of the output is not Hel\tlo

- e The escape character is not processed for the default option

[[email protected] ~]# echo ' Hel\tlo '

Hel\tlo

3. History : View commands that have been used by history

Usage: History [OPTION]

Options: - C Clear histrory

N lists the most recently used last N Bar Command

[[Email protected] ~]# History 5

145 Clear

146 which Mans

147 Whereis Histroy

148 which Histroy

149 History 5

Bash to invoke a command in the command history list:

     !#: call history in the first # Bar Command ( # as a number)

     !!: call the previous command

!string: Execute command command last time in history string command at the beginning

     !$: call the last parameter of the previous command

4. Nano : Simple text editor

format: Nano [OPTIONS] [[[+line,column] FILE] ...

Editor using:

Ctrl+y : Previous Page

Ctrl + V : Next Page

Ctrl+o : Save

ctrl+x : Exit

ctrl+g : Get help

This article is from the "Summer Month" blog, please make sure to keep this source http://lkc0110.blog.51cto.com/3410558/1689569

Linux Common commands Summary (Pwd,echo,history,nano)