SHELL OPERATOR TEST - FILE TEST OPERATORS
test command (or) [ ] operator is used to evaluate
file test operations. file test operators are classified based on
the file types and file modes.
UNIX/Linux file types are:-
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regular (or) ordinary file (-f)
directory(-d)
linkfile(or) softlink (-l)
character device (-c)
block device (-b)
named pipe(-p)
Socket file(-S)
file mode(operation)
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read(-r)
write(-w)
execute(-x)
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