$# question Post: 34215

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Top Forums Shell Programming and Scripting $# question Post 34215 by criglerj on Sunday 9th of February 2003 05:13:06 PM

02-09-2003

Registered User

Re: $# question

You weren't very specific, so I'll answer from the Bourne/Korn/zsh perspective.

Quote:

Originally posted by google
$# holds the number of arguments passed into a shell. Is this value the index of an array?

No, as you already wrote, it's the number of arguments passed into the shell. (The array thing is a C-shell -ism.) You access the arguments by using the variables $1, $2, etc. If there are more than nine arguments, you can use ${10}, ${11}, etc. There are lots of ways to scan through the arguments looking for something.

Quote:

google continued
and if so, is there a way to determine the max index of the array so that I can know right off how many values were passed in? or do I have to sit in some sort of loop testing to see if $# is set, incrementing $# along the way? the goal here is to use the max index to define the iteration argument of a loop.

I think all you need is something like this:

Code:

i=1
while [ $i -lt "$#" ] ; do
    eval arg=\${$i}
    # Do something with $arg here
    i=`expr $i + 1`
done

With Korn and Z shells, you get built in simple arithmetic and don't need to invoke expr.

Unless you need to hold on to the previous values in place (rare in practice), the more usual idiom is something like this:

Code:

while [ "$#" -gt 0 ]; do
    # Do something with $1 here
    shift   # Move $1 out, shifting $2->$1, $3->$2, etc
done

Re: the quotes around $#: The Vim syntax hilighting barfs on this expression when it is unquoted.

criglerj

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LEARN ABOUT DEBIAN

glenablevertexattribarray

GLENABLEVERTEXATTRIB(3G)					  [FIXME: manual]					  GLENABLEVERTEXATTRIB(3G)

NAME

       glEnableVertexAttribArray, glDisableVertexAttribArray - Enable or disable a generic vertex attribute array

C SPECIFICATION

       void glEnableVertexAttribArray(GLuint index);

       void glDisableVertexAttribArray(GLuint index);

PARAMETERS

       index
	   Specifies the index of the generic vertex attribute to be enabled or disabled.

DESCRIPTION

       glEnableVertexAttribArray enables the generic vertex attribute array specified by index.  glDisableVertexAttribArray disables the generic
       vertex attribute array specified by index. By default, all client-side capabilities are disabled, including all generic vertex attribute
       arrays. If enabled, the values in the generic vertex attribute array will be accessed and used for rendering when calls are made to vertex
       array commands such as glDrawArrays(), glDrawElements(), glDrawRangeElements(), glMultiDrawElements(), or glMultiDrawArrays().

ERRORS

       GL_INVALID_VALUE is generated if index is greater than or equal to GL_MAX_VERTEX_ATTRIBS.

ASSOCIATED GETS

       glGet() with argument GL_MAX_VERTEX_ATTRIBS

       glGetVertexAttrib() with arguments index and GL_VERTEX_ATTRIB_ARRAY_ENABLED

       glGetVertexAttribPointerv() with arguments index and GL_VERTEX_ATTRIB_ARRAY_POINTER

SEE ALSO

       glBindAttribLocation(), glDrawArrays(), glDrawElements(), glDrawRangeElements(), glMultiDrawElements(), glVertexAttrib(),
       glVertexAttribPointer()

COPYRIGHT

       Copyright (C) 2003-2005 3Dlabs Inc. Ltd. This material may be distributed subject to the terms and conditions set forth in the Open
       Publication License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

[FIXME: source] 						    05/30/2012						  GLENABLEVERTEXATTRIB(3G)