[Shell] basic Shell functions: Historical commands & aliases

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I. History commands

History # view History commands

 

History-C # Clear history commands

 

History-W # exit without waiting. directly write the history commands in the cache to the history command to save the file ~ /. Bash_history

 

Vim/etc/profile # The default history command saves 1000 records. You can modify the histsize to save the number of records (unlimited). The command is saved in ~ /. Bash_history File

 

Call Of History commands:

1. Call up and down arrows

2 .! N # Run the command whose line number is N. The command displayed in History displays the corresponding line number before it.

3 .! His # execute the last command starting with his

 

Command and file completion: Tab

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Ii. aliases and shortcut keys

Alias Vi = "Vim" # defines the alias, which takes effect temporarily

Alias # view all aliases

 

Command Execution sequence:

First, use the absolute or relative path to execute the command.

Alias for second-order execution

Third, execute bash Internal commands.

Fourth, run the first command in the search order defined by the $ PATH environment variable; echo $ path; you can see the path of a series of commands. The system command does not use the path, this is because the environment variable is set and is automatically searched.

 

Permanent save alias:

Edit the. bashrc file in the home directory and write alias Vi = 'vim.

Vim/root/. bashrc

Vim/home/. bashrc

 

Delete alias:

Unalias VI # unalias alias

 

Common bash shortcut keys:

CTRL + C terminate command

CTRL + l clear screen

CTRL + u command before deleting or cutting the cursor

CTRL + k delete or cut the content after the cursor

CTRL + y paste Ctrl + U or Ctrl + k cut content

CTRL + R search in the History command. After pressing CTRL + R, the search page appears. You only need to enter the search content and search from the history command.

CTRL + D Exit the current terminal (equivalent to Exit)

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