Linux command line knowledge: apropos command parameters and usage introduction

If you do not know the name of the command required to complete a particular task, you can use a keyword to search for it through the Linux apropos utility. The utility can search for keywords and display a short description of all man pages that contain matches. In addition, using the man utility and the -k (keyword) option, you can get the same result as the Linux apropos utility (actually the same command).

The following is a list of Linux apropos command:

 [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: :LDA P::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