01-31-2011
Sorting is not necessary. All it does is create an (associative) array element with the entire line as the index without a value (or 0 is you will). The exclamation mark negates that value so the outcome is 1 (true). The value of 1 in awk means perform the default action which is {print $0} so the entire line gets printed.
Afterwards the ++ comes into action and 1 is added to the array value, which now becomes 1. So that next time the same line is encountered the value returned by the array is 1 which is then negated to 0 by the exclamation mark, so nothing will get printed.
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LEARN ABOUT DEBIAN
plstyl
PLSTYL(3plplot) PLplot API PLSTYL(3plplot)
NAME
plstyl - Set line style
SYNOPSIS
plstyl(nels, mark, space)
DESCRIPTION
This sets up the line style for all lines subsequently drawn. A line consists of segments in which the pen is alternately down and up. The
lengths of these segments are passed in the arrays mark and space respectively. The number of mark-space pairs is specified by nels. In
order to return the line style to the default continuous line, plstyl(3plplot) should be called with nels=0.(see also pllsty(3plplot))
Redacted form: plstyl(mark, space)
This function is used in examples 1,9,14.
ARGUMENTS
nels (PLINT, input)
The number of mark and space elements in a line. Thus a simple broken line can be obtained by setting nels=1. A continuous line is
specified by setting nels=0.
mark (PLINT *, input)
Pointer to array with the lengths of the segments during which the pen is down, measured in micrometers.
space (PLINT *, input)
Pointer to array with the lengths of the segments during which the pen is up, measured in micrometers.
AUTHORS
Geoffrey Furnish and Maurice LeBrun wrote and maintain PLplot. This man page was automatically generated from the DocBook source of the
PLplot documentation, maintained by Alan W. Irwin and Rafael Laboissiere.
SEE ALSO
PLplot documentation at http://plplot.sourceforge.net/resources.
August, 2012 PLSTYL(3plplot)