Linux Cloud Computing Cluster Architecture Learning notes: 1-3 viewing file contents

View File Contents 1.cat command

Function: View the contents of a file

Syntax: Cat file name

2. More Commands

Role: View the contents of a file by paging

Syntax: more file names

Example: MORE/ETC/PASSWD

Press ENTER to refresh a row, press the space to refresh one screen

Exit: Press Q Health

3.less command

Role: View the contents of a file by paging

Syntax: less file name

Example: LESS/ETC/PASSWD

Use the cursor keys to page UP

Exit: Press Q Health

Summary:

The difference between more and less in Linux

MORE: Does not support back, but almost no need to add parameters, the space bar is the page down, the ENTER key is down the line, in the case of no need to back the situation is convenient.

Less: Supports rollover, either up (PageUp button) or down (pagedown button). , the SPACEBAR is a page down, and the ENTER key is a downward-turning line

4. Head command

Function: View the first few lines of the file

Syntax: Head-n file name (n is a specific number that represents the first n rows)

Example: View/etc/passwd Top 3 lines of content

[Email protected] ~]# head-3/etc/passwd

Root:x:0:0:root:/root:/bin/bash

Bin:x:1:1:bin:/bin:/sbin/nologin

Daemon:x:2:2:daemon:/sbin:/sbin/nologin

5.tail command

Function: View the contents of the file after several lines

Syntax: Tail-n file name (n is a specific number that represents the reciprocal n line)

Description: Starting from the following line, viewing the file, showing the last 10 rows by default

Parameter-n shows how many rows

Example: Add an Nginx user, the/etc/passwd file will be appended to the Nginx user-related information, can be displayed with the tail command

[Email protected] ~]# Useradd nginx

[Email protected] ~]# tail-1/etc/passwd

Nginx:x:1002:1002::/home/nginx:/bin/bash

[Email protected] ~]#

-F Dynamic Display data (not closed) often used to view logs

Linux Cloud Computing Cluster Architecture Learning notes: 1-3 viewing file contents