Linux Shell Learning Notes (i)

The shell, known as a program that acts as an interface between the user and the Linux OS, allows the user to enter commands that need to be executed to the OS. There are a lot of shells here, just bash.

　　0) Shell version of the experiment

Show Shell version:

/bin/bash--version

Results:

　　

1) file. bash_history

This file saves the history command, which is usually saved when the user exits the shell normally, in the directory: "~/.bash_history".

Command Display ~ directory, all files with. Start:

ls grep " .* "

Results:

　　

　　①!!, two exclamation mark means "execute last command";

　　②!n, which indicates the execution of the nth command in the history command;

　　③!string, which represents the first command in the execution History command that starts with string;

　　2) redirect

　　Redirects include: redirected output and redirected output.

　　① REDIRECT Output

　　 redirect the display to the Test.txt file:

ls -l > Test.txt

Using VIM to open the file, the results are as follows:

　　　　

Append the results of the PS command to the Test.txt file:

PS >> test.txt

Results:

　　

　　② REDIRECT Input

Redirect the contents of the Test.txt file to the more command:

 More < Test.txt

Results:

　　

Linux Shell Learning Notes (i)