this is 4uu_fig1, 1au_fig3

PAUSE

If they want to quit, do so

YES

SIMPLIFIED FILE SYSTEM
Think of a tree held up side down
 / 
/ is the root of the file system tree.
The root is what everything hangs from.
 /  
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/
/
bin/
bin is where executable programs are kept (executable="runable").
bin/
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etc/
etc is where files used by the system administrator are kept.
etc/
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usr/
 /
 /
 /
lib/
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spool/
        usr is where user utilities and various libraries,
        printer queueing files, mail files, etc. are kept.
usr/
lib/
spool/
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\
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usr2/
usr2 is a typical user file system where users have
their home directories.                                    
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 /
 /
ann
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bob
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dan
-------
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gail
\
\
tom
ann
ann
bob
bob
dan
dan
gail
gail
tom
tom
ann
ann
bob
bob
dan
dan
gail
gail
tom
tom