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如果你不知道完成某个特定任务所需要命令的名称，可以使用一个关键字通过Linux apropos实用程序来搜索它。该实用程序可以搜索关键字并且显示所有包含匹配项的man页面的简短描述。另外，使用man实用程序和-k（关键字）选项，可以得到和用Linux apropos实用程序相同的结果（实际上是相同的命令）。
以下是Linux apropos命令列表：
- [root@localhost ~]# man -k who
- at.allow [at] (5) - determine who can submit jobs via at or batch
- at.deny [at] (5) - determine who can submit jobs via at or batch
- jwhois (1) - client for the whois service
- jwhois (rpm) - Internet whois/nicname client.
- Net::LDAP::Extension::WhoAmI (3pm) - LDAP Who am I? Operation
- w (1) - Show who is logged on and what they are doing
- who (1p) - display who is on the system
- who (1) - show who is logged on
- whoami (1) - print effective userid
- [root@localhost ~]# apropos who
- at.allow [at] (5) - determine who can submit jobs via at or batch
- at.deny [at] (5) - determine who can submit jobs via at or batch
- jwhois (1) - client for the whois service
- jwhois (rpm) - Internet whois/nicname client.
- Net::LDAP::Extension::WhoAmI (3pm) - LDAP Who am I? Operation
- w (1) - Show who is logged on and what they are doing
- who (1p) - display who is on the system
- who (1) - show who is logged on
- whoami (1) - print effective userid
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