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Exec Command
EXEC <function-name> [<sortarg>]r INIT [<initarg>]r
where
<function-name> is the name of the external command,
<sortarg>r is a list of runtime arguments, eg. sortwords, spectrum
names,
<initarg>r is a list of initialisation arguments to the function,
eg. filenames.
The EXEC command
allows externally defined subroutines to be accessed from the sort.
It allows different sorting and storage algorithms to be used via the
sort language.
See Appendix B for the more information on the EXEC command and
how to use it to access the hypercube sort function SYM4D.
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