apropos searches system commands for a given keywords and displays the result on the standard output.
Syntax:
apropos <keyword>
example :
apropos scan - Gives the output like
clamscan (1) - scan files and directories for viruses
gawk (1) - pattern scanning and processing language
memchr (3) - scan memory for a character
quotacheck (8) - scan a filesystem for disk usage, create, check and repair quota files
scandir (3) - scan a directory for matching entries
scanf (3) - input format conversion
scanf (3p) - convert formatted input
ssh-keyscan (1) - gather ssh public keys
strchr (3p) - string scanning operation
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