root@CENTOS7 ~]# cat /etc/redhat-release
CentOS Linux release 7.7.1908 (Core)
[root@CENTOS7 ~]#
You can refer to the command manual with the * Linux * man command.
When referencing the cp command, the command is as follows.
man cp
command
[root@CENTOS7 ~]# man cp
cp(1)
CP(1) User Commands CP(1)
NAME
cp - copy files and directories
SYNOPSIS
cp [OPTION]... [-T] SOURCE DEST
cp [OPTION]... SOURCE... DIRECTORY
cp [OPTION]... -t DIRECTORY SOURCE...
DESCRIPTION
Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.
Mandatory arguments to long options are mandatory for short options
too.
-a, --archive
same as -dR --preserve=all
--attributes-only
don't copy the file data, just the attributes
--backup[=CONTROL]
Manual page cp(1) line 1 (press h for help or q to quit)
Here, ** CP (1) ** is displayed, but the meanings of the numbers (section numbers) in ** () ** are as follows.
| Section number | Contents |
|---|---|
| 1 | Execution program or shell command |
| 2 | System call(Functions provided by the kernel) |
| 3 | Library call (function included in the program library) |
| 4 | Special file (usually/Files that exist under dev) |
| 5 | File formats and conventions (eg: /etc/passwd） |
| 6 | game |
| 7 | Various other things (including macro packages and customs). |
| 8 | System administration commands (usually for root) |
| 9 | Kernel routine[Non-standard] |
You can refer to the above section numbers with the following command.
man man
command
[root@CENTOS7 ~]# man man
MAN(1)
MAN(1)Man page utility MAN(1)
name
man -Online manual interface
Format
man [-C file] [-d] [-D] [--warnings[=warnings]] [-R encoding] [-L
locale] [-m system[,...]] [-M path] [-S list] [-e extension] [-i|-I]
[--regex|--wildcard] [--names-only] [-a] [-u] [--no-subpages] [-P
pager] [-r prompt] [-7] [-E encoding] [--no-hyphenation] [--no-justifi‐
cation] [-p string] [-t] [-T[device]] [-H[browser]] [-X[dpi]] [-Z]
[[section] page ...] ...
man -k [apropos options] regexp ...
man -K [-w|-W] [-S list] [-i|-I] [--regex] [section] term ...
man -f [whatis options] page ...
man -l [-C file] [-d] [-D] [--warnings[=warnings]] [-R encoding] [-L
locale] [-P pager] [-r prompt] [-7] [-E encoding] [-p string] [-t]
[-T[device]] [-H[browser]] [-X[dpi]] [-Z] file ...
man -w|-W [-C file] [-d] [-D] page ...
man -c [-C file] [-d] [-D] page ...
man [-?V]
Description
man is a system manual reference tool(Pager)is. man
Arguments given to page
Is usually the name of a program, utility, or function. To these arguments
Search for and display related man pages.
If section is specified, man is directly in the manual section
Search only pages within the section. Default behavior is available
Sections Search all in a predefined order and find the first page
It is displayed. pages with multiple sections
Only the first one is displayed, even if it is present in.
The following table shows the section numbers in the manual and their sections.
Indicates the type of page contained in.
1 Execution program or shell command
2 system call(Functions provided by the kernel)
3 Library call(Functions included in the program library)
4 Special file(Normal/Files that exist under dev)
5 File formats and conventions(Example: /etc/passwd)
6 games
7 Other things(Includes macro packages, conventions, etc.).. For example
man(7)And groff(7)。
8 System management commands(Usually for root)
9 Kernel routine[Non-standard]
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abridgement
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that's all