Equivalent Commands

[Jeff]

Hi All,

        I am wondering if there are Linux commands that are equivalent 
to the MS-DOS commands:

mem/c  ( output is used memory and available memory )
dir  ( part of the output is the amount of *free* disk space )

Yah, I know ls ~ dir.  I can't find a way to display the free disk 
space with ls and I don't even know if ls is the proper command.  A 
pointer to the appropriate man pages would be appreciated.

TIA



jeff
[EMAIL PROTECTED]
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Die dulci fruere.