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This article mainly explains "how to view and edit the commands that have been executed in the Linux command terminal". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to view and edit the commands that have been executed in the Linux command terminal".

History

The history command can be used to display the commands that have been executed, or to re-execute the required commands according to the treatment shown.

N display n recent records

-an add record

-r reads records, but does not add content records

-w overwrite the original history file

-c clear the record

-d [n] Delete specified n records

-n read the specified file

-r reads the file but does not record

-w overwrite the original file

Example 1

The code is as follows:

[root@redhat ~] # history # View all executed commands

1 ls

2 pwd

3 fc-l

4 history

The code is as follows:

[root@redhat ~] # history 2 # shows 2 entries

4 history

5 history 2

The code is as follows:

[root@redhat ~] #! 4 # execute the command number 4, pay attention to the exclamation mark

History

1 ls

2 pwd

3 fc-l

4 history

5 history 2

6 history

The code is as follows:

[root@redhat ~] # history-c # clear History

! $refers to the last argument of the previous command

The code is as follows:

[tank@localhost workspace] $ls-all

The total dosage is 1060

Drwxrwxr-x. 15 tank tank 4096 August 6 16:26

Drwx-. 60 tank tank 4096 August 15 16:13..

-rw-r--r-- 1 root root 2466 July 23 18:02 1.html

Drwxr-xr-x 7 tank tank 4096 July 17 03:02 ckeditor

Drwxr-xr-x. 2 tank tank 4096 May 29 00:08 database

The code is as follows:

[tank@localhost workspace] $! $# get-all

-all

Bash:-all: command not found

Example 2

The code is as follows:

[root@redhat] #!-N # execute the penultimate N command

[root@redhat ~] #! # execute the previous command

Fc

The fc command can edit commands that have been executed before and re-execute them in batch form

-1 lists all instructions for the quota between the first instruction and the last instruction

-n does not display the number

-r reverse sort

-e specifies text editor editing, default Vi

-s select instruction execution

Example 1

The code is as follows:

[root@redhat ~] # fc-l # View the executed command, root history, very similar

Eval echo "aaa" ls

349 eval echo "aaa"; ls

350 exec ls

351 apt-get install mysql

352 apt-get install mysql-server

353 exit

354 expr 4% 6

355 expr 4% 6

356 expr 4

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