Select command help with blank input value Post: 302840773

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vselect

vselect(1Vi)															      vselect(1Vi)

NAME

       vselect - select objects from a Vista data file

SYNOPSIS

       vselect [-option ...] [infile] [outfile]

DESCRIPTION

       vselect copies selected objects from an input file to an output file.

       Command	line  options specify which objects are to be copied. Objects may be selected by type (e.g., all images), by name, by the value of
       some attribute, or by position within the input file.

COMMAND LINE OPTIONS

       vselect accepts the following options:

       -help	      Prints a message describing options.

       -in	      Specifies a Vista data file from which objects are to be selected.

       -out	      Specifies where to write the selected objects as a Vista data file.

       The input and output files can be specified on the command line or allowed to default to the standard input and output streams.

       In addition, exactly one of the following options must be used to specify the objects to be selected:

       -object i      Select the ith object. Objects in the input file are numbered consecutively from 0.

       -name name     Select any object whose attribute name is name.

       -type type     Select any object whose type is type.

       -attr name value
		      Select any object having an attribute with the specified name and value.

       Finally, any of these selection criteria can be inverted:

       -not	      Reverses the sense of the selection criterion.

EXAMPLES

       To select the first object from a file:

	      vselect -object 0 < infile > outfile

       To select the attribute named ``cantaloupe'' from a file:

	      vselect -name cantaloupe < infile > outfile

       To select everything but images from a file:

	      vselect -type image -not < infile > outfile

       To select images with ubyte pixels from a file of images:

	      vselect -attr nbands ubyte < infile > outfile

AUTHOR

       Art Pope <pope@cs.ubc.ca>

Vista Version 1.12						   24 April 1993						      vselect(1Vi)