刚发现从来也没用过的Linux apropos, 直接输入apropos [keyword], 即可查看与keyword相关功能的命令。 该命令实际完成的是搜索其它命令的描述信息，将相关命令罗列出来，不一定出现的命令就是想要的，但可以从中帮助回忆到有用的命令。
Linux apropos使用方法，man apropos 自己看。
Linux apropos例子
用Linux apropos查找和sort相关的命令：
apropos sort
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 (1) - a block-sorting file compressor, v1.0.2
bunzip2 [bzcat] (1) - a block-sorting file compressor, v1.0.2
bunzip2 [bzip2] (1) - a block-sorting file compressor, v1.0.2
bunzip2 [bzip2recover] (1) - a block-sorting file compressor, v1.0.2
bzip2 (1) - a block-sorting file compressor, v1.0.2
bzip2 [bunzip2] (1) - a block-sorting file compressor, v1.0.2
bzip2 [bzcat] (1) - a block-sorting file compressor, v1.0.2
bzip2 [bzip2recover] (1) - a block-sorting file compressor, v1.0.2
comm (1) - compare two sorted files line by line
iterator_info_s [netsnmp_iterator_info_s] (3) - Holds iterator information containing functions which should be called by the iterator_handler to loop over your data set and sort it in a SNMP specific manner
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
lsort (n) - Sort the elements of a list
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
texindex (1) - sort Texinfo index files
tsort (1) - perform topological sort
tsort (1p) - topological sort
uniq (1) - remove duplicate lines from a sorted file
versionsort [scandir] (3) - scan a directory for matching entries
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