Linux apropos --根据关键字搜索命令

用途说明
因为Linux的Shell中使用的是命令行方式，有时候会忘记执行特定任务的命令，就可以使用apropos找出来。等同于man-k，在使用的时候还是觉得用man -k来的好，毕竟apropos这个命令有些难记。
此命令需要指定一个keyword作为参数，查找与该keyword有关的命令。手册页中的解释是：在whatis数据库中搜索字符串。searchthe whatis database for strings。

常用参数
无。
命令格式为：aproposkeyword
等同于：man -k keyword
使用示例
示例一
[root@web ~]#
apropos who
at.allow[at] (5) - determine who cansubmit jobs via at or batch
at.deny[at] (5) - determine whocan submit jobs via at or batch
jwhois (1) - client for the whois service
jwhois (rpm) - Internet whois/nicname client.
w (1) - Show who is logged on and what they are doing
who (1) - show who is logged on
who (1p) - display who is on the system
whoami (1) - print effective userid
[root@web ~]#
man -k who
at.allow[at] (5) - determine who cansubmit jobs via at or batch
at.deny[at] (5) - determine whocan submit jobs via at or batch
jwhois (1) - client for the whois service
jwhois (rpm) - Internet whois/nicname client.
w (1) - Show who is logged on and what they are doing
who (1) - show who is logged on
who (1p) - display who is on the system
whoami (1) - print effective userid
从以上输出来看，apropos和man -k的输出是相同的。

示例二
[root@web ~]#
apropos apropos
apropos (1) - search the whatis database for strings
man (rpm) - A set of documentation tools: man, apropos and whatis.
[root@web ~]#
man -k apropos
apropos (1) - search the whatis database for strings
man (rpm) - A set of documentation tools: man, apropos and whatis.
示例三
[root@web ~]#
apropos sort
FcFontSort (3) - Return list of matching fonts
alphasort[scandir] (3) - scan a directory for matching entries
bsearch (3) - binary search of a sorted array
bsearch (3p) - binary search a sorted table
bunzip2[bzip2] (1) - a block-sorting filecompressor, v1.0.3
bzip2 (1) - a block-sorting file compressor, v1.0.3
comm (1) - compare two sorted files line by line
ldap_sort_entries (3) - LDAP sorting routines
ldap_sort_entries[ldap_sort] (3) - LDAP sorting routines
ldap_sort_entries[ldap_sort_strcasecmp] (3) - LDAP sorting routines
ldap_sort_entries[ldap_sort_values] (3) - LDAP sorting routines
ldap_sort_strcasecmp(3) - LDAP sorting routines
ldap_sort_strcasecmp[ldap_sort] (3) - LDAP sorting routines
ldap_sort_strcasecmp[ldap_sort_entries] (3) - LDAP sorting routines
ldap_sort_strcasecmp[ldap_sort_values] (3) - LDAP sorting routines
ldap_sort_values (3) - LDAP sorting routines
ldap_sort_values[ldap_sort] (3) - LDAP sorting routines
ldap_sort_values[ldap_sort_entries] (3) - LDAP sorting routines
ldap_sort_values[ldap_sort_strcasecmp] (3) - LDAP sorting routines
qsort (3) - sorts an array
qsort (3p) - sort a table of data
sort (1) - sort lines of text files
sort (1p) - sort, merge, or sequence check text files
sort (3pm) - perl pragma to control sort() behaviour
tsort (1) - perform topological sort
tsort (1p) - topological sort
versionsort[scandir] (3) - scan a directory for matching entries