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Full Discussion: While condition in shell script
Top Forums UNIX for Dummies Questions & Answers While condition in shell script Post 302772734 by Yoda on Tuesday 26th of February 2013 03:28:48 PM
Old 02-26-2013
You are right.

Boolean operator: -o is logical OR. If one of the operands is true then condition would be true.

There are other Boolean operators:

-a for logical AND and ! for logical negation.
 

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LEARN ABOUT XFREE86

gllogicop

GLLOGICOP(3G)															     GLLOGICOP(3G)

NAME

       glLogicOp - specify a logical pixel operation for color index rendering

C SPECIFICATION

       void glLogicOp( GLenum opcode )

PARAMETERS

       opcode  Specifies  a  symbolic  constant  that selects a logical operation.  The following symbols are accepted: GL_CLEAR, GL_SET, GL_COPY,
	       GL_COPY_INVERTED,  GL_NOOP,  GL_INVERT,	GL_AND,  GL_NAND,  GL_OR,  GL_NOR,  GL_XOR,  GL_EQUIV,	GL_AND_REVERSE,   GL_AND_INVERTED,
	       GL_OR_REVERSE, and GL_OR_INVERTED. The initial value is GL_COPY.

DESCRIPTION

       glLogicOp  specifies  a logical operation that, when enabled, is applied between the incoming color index or RGBA color and the color index
       or RGBA color at the corresponding location in the frame buffer.  To enable or disable the logical operation, call glEnable  and  glDisable
       using  the  symbolic  constant GL_COLOR_LOGIC_OP for RGBA mode or GL_INDEX_LOGIC_OP for color index mode. The initial value is disabled for
       both operations.

							 ---------------------------------------
							 Opcode 	    Resulting Operation
							 ---------------------------------------
							 GL_CLEAR		     0
							 GL_SET 		     1
							 GL_COPY		     s
							 GL_COPY_INVERTED	    ~s
							 GL_NOOP		     d
							 GL_INVERT		    ~d
							 GL_AND 		   s & d
							 GL_NAND		 ~(s & d)
							 GL_OR			   s | d
							 GL_NOR 		 ~(s | d)
							 GL_XOR 		   s ^ d
							 GL_EQUIV		 ~(s ^ d)
							 GL_AND_REVERSE 	  s & ~d
							 GL_AND_INVERTED	  ~s & d
							 GL_OR_REVERSE		  s | ~d
							 GL_OR_INVERTED 	  ~s | d
							 ---------------------------------------

       opcode is a symbolic constant chosen from the list above.  In the explanation of the logical operations, s represents  the  incoming  color
       index  and  d  represents  the index in the frame buffer.  Standard C-language operators are used.  As these bitwise operators suggest, the
       logical operation is applied independently to each bit pair of the source and destination indices or colors.

NOTES

       Color index logical operations are always supported. RGBA logical operations are supported only if the GL version is 1.1 or greater.

       When more than one RGBA color or index buffer is enabled for drawing, logical operations are performed separately for each enabled  buffer,
       using for the destination value the contents of that buffer (see glDrawBuffer).

ERRORS

       GL_INVALID_ENUM is generated if opcode is not an accepted value.

       GL_INVALID_OPERATION is generated if glLogicOp is executed between the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS

       glGet with argument GL_LOGIC_OP_MODE.
       glIsEnabled with argument GL_COLOR_LOGIC_OP or GL_INDEX_LOGIC_OP.

SEE ALSO

       glAlphaFunc(3G), glBlendFunc(3G), glDrawBuffer(3G), glEnable(3G), glStencilOp(3G)

																     GLLOGICOP(3G)
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