Command | man | Purpose | On-line manual pages | Synopsis | man [options] [section] [title] |
Description: The man command formats and displays the on-line manual pages. This version knows about the MANPATH and (MAN) PAGER environment variables, so you can have your own set(s) of personal man pages and choose whatever program you like to display the formatted pages. If section is specified, man only looks in that section of the manual.
Options:
-M | Specify the list of directories to search for man pages. If no such option is given, the environment variable MANPATH is used. | -a | By default, man will exit after displaying the first manual page it finds. Using this option forces man to display all the manual pages that match name, not just the first. |
Command | clear | Purpose | Clears the terminal screen | Synopsis | clear |
Description: The clear command clears your screen. It looks in the environment for the terminal type and then in the terminfo database to figure out how to clear the screen.
Command | pwd | Purpose | Prints the working directory | Synopsis | pwd |
Description: The pwd prints the fully resolved name of the current directory.
Command | echo | Purpose | Prints a line of text | Synopsis | Echo [options] ... [string] ... |
Description: The echo writes each given STRING to standard output, with a space between each and a newline after the last one.
Options:
-n | Do not output the trailing newline. |
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Linux General Commands 
