剛發現從來也沒用過的Linux apropos, 直接輸入apropos [keyword], 即可查看與keyword相關功能的命令。 該命令實際完成的是搜索其它命令的描述信息，將相關命令羅列出來，不一定出現的命令就是想要的，但可以從中幫助回憶到有用的命令。
Linux apropos使用方法，man apropos 自己看。
Linux apropos例子
用Linux apropos查找和sort相關的命令：
- 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