TLDR
Enter a command. For example: log, appsleepd, open, diskutil.

whatis

 
Tool that searches a set of database files containing short descriptions of system commands for keywords. More information: http://www.linfo.org/whatis.html.
 
  • Search for information about keyword:
     
    whatis {{keyword}}
     
  • Search for information about multiple keywords:
     
    whatis {{first_keyword}} {{second_keyword}}
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