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Full Discussion: If Error then Exit
Top Forums Shell Programming and Scripting If Error then Exit Post 302674965 by 244an on Saturday 21st of July 2012 03:02:43 AM
Old 07-21-2012
Quote:
Originally Posted by bakunin
...
Code:
command && echo "error occurred"

The second variant uses the logical meaning of non-zero being FALSE, the "&&" is a logical "OR": that way, if "command" returns "FALSE", the second command is executed, otherwise not.

I hope this helps.

bakunin
I think "&&" is the logical "AND", "||" means "OR", so it should be
Code:
 command || echo "error occurred"

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VARIANT_XOR(3)								 1							    VARIANT_XOR(3)

variant_xor - Performs a logical exclusion on two variants

SYNOPSIS
mixed variant_xor (mixed $left, mixed $right) DESCRIPTION
Performs a logical exclusion. PARAMETERS
o $left - The left operand. o $right - The right operand. Note As with all the variant arithmetic functions, the parameters for this function can be either a PHP native type (integer, string, floating point, boolean or NULL), or an instance of a COM, VARIANT or DOTNET class. PHP native types will be converted to variants using the same rules as found in the constructor for the "VARIANT" class. COM and DOTNET objects will have the value of their default property taken and used as the variant value. The variant arithmetic functions are wrappers around the similarly named functions in the COM library; for more information on these functions, consult the MSDN library. The PHP functions are named slightly differently; for example variant_add(3) in PHP cor- responds to VarAdd() in the MSDN documentation. RETURN VALUES
Variant XOR Rules +------------+--------------------+---+ |If $left is | | | | | | | | | If $right is | | | | | | | | then the result is | | | | | | +------------+--------------------+---+ | | | | | TRUE | | | | | | | | | | | | | TRUE | | | | | | | | | | | | FALSE | | | | | | | | | | | TRUE | | | | | | | | | | | | | FALSE | | | | | | | | | | | | TRUE | | | | | | | | | | | FALSE | | | | | | | | | | | | | TRUE | | | | | | | | | | | | TRUE | | | | | | | | | | | FALSE | | | | | | | | | | | | | FALSE | | | | | | | | | | | | FALSE | | | | | | | | | | | NULL | | | | | | | | | | | | | NULL | | | | | | | | | | | | NULL | | | | | | +------------+--------------------+---+ SEE ALSO
variant_or(3), variant_and(3). PHP Documentation Group VARIANT_XOR(3)
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