Viewing Online Documentation

To find a Linux command to perform a particular function, use the apropos or man -k commands to search the online documentation. For example, to see commands related to "calendar":

apropos calendar
man -k calendar      # same as the above!

To view information about a Linux command, use the online manual (manpages), accessed with the man command:

man commandname

For example, to view the online manual page for cp, enter the command:

man cp

On Windows, you can see a list of commonly used commands by typing

help

To view information about a Windows command, use the online help:

help commandname

For example, to view the online help for dir, enter the command:

help dir

Alternately, to get a brief help summary for a command, enter the name of the command followed by /? -- for example, to get a help summary for the copy command, type

copy /?