Shell scripting in Bash

[Dale Scheetz <dwarf@polaris.net>]

I have been trying to learn shell scripting using the man page for bash.
Asside from the need for a lot of reading between the lines, there seem to
be several errors. == is declared to be the equality operator, but = is
the correct syntax. || is declared to be the or operator, but although:

if [ a != b ]

works fine

if [ a != b || c != d ]

fails with several errors ( ']' not found, and != command not found )

I have tried to enclose the expressions in {} with the same results.

What is the correct syntax for this kind of statement?

TIA,

Dwarf

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