Centos之帮助命令

帮助命令man (manual)

比如我们可以看下man命令的解释

[root@localhost ~]# man man

MAN(1) Manual pager utils MAN(1)

NAME

man - an interface to the on-line reference manuals

SYNOPSIS

man [-C file] [-d] [-D] [--warnings[=warnings]] [-R encoding] [-L locale] [-m system[,...]] [-M path] [-S list] [-e exten‐

sion] [-i|-I] [--regex|--wildcard] [--names-only] [-a] [-u] [--no-subpages] [-P pager] [-r prompt] [-7] [-E encoding]

[--no-hyphenation] [--no-justification] [-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 the system's manual pager. Each page argument given to man is normally the name of a program, utility or function.

The manual page associated with each of these arguments is then found and displayed. A section, if provided, will direct

man to look only in that section of the manual. The default action is to search in all of the available sections, follow‐

Manual page man(1) line 1 (press h for help or q to quit)

查看完按 "q"键，离开

我们看下ls

man ls

这里其实有很多行我们可以按键盘的向下键盘，来显示下方隐藏的内容；

当然也可以搜索

/ 加搜索内容

比如搜索 -d

/-d

这里的1是man的级别；这里的1是查看命令的帮助

1：查看命令的帮助

2：查看可被内核调用的函数的函数的版主

3：查看函数和函数库的帮助

4：查看特殊文件的帮助（主要是/dev目录下的文件）

5：查看配置文件的帮助

6：查看游戏的帮助

7：查看其他杂项的帮助

8：查看系统管理员可用命令的帮助

9：查看和内核相关文件的帮助

查看命令拥有哪个级别的帮助

man -f 命令

相当于

whatis 命令

举例

man -5 passwd

man -4 null

man -8 ip

比如查看ls的命令级别

[root@localhost ~]# man -f ls

ls (1) - list directory contents

[root@localhost ~]#

只有1个

[root@localhost ~]# man -f ip

ip (8) - show / manipulate routing, devices, policy routing...

[root@localhost ~]#

查看和命令相关的所有帮助

man -k 命令

相当于

appropos 命令

例如

apropos passwd

[root@localhost ~]# man -k passwd

chpasswd (8) - 批量更新密码

gpasswd (1) - 管理员 /etc/group 和 /etc/gshadow

grub2-mkpasswd-pbkdf2 (1) - Generate a PBKDF2 password hash.

lpasswd (1) - Change group or user password

pam_localuser (8) - require users to be listed in /etc/passwd

passwd (1) - update user's authentication tokens

sslpasswd (1ssl) - compute password hashes

pwhistory_helper (8) - Helper binary that transfers password hashes from ...

[root@localhost ~]#

能把相关的命令都查询出来；

巴特西

Centos之帮助命令

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