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6.10 GFORTRAN_LIST_SEPARATOR – Separator for list output

This environment variable specifies the separator when writing list-directed output. It may contain any number of spaces and at most one comma. If you specify this on the command line, be sure to quote spaces, as in

     $ GFORTRAN_LIST_SEPARATOR='  ,  ' ./a.out

when a.out is the gfortran program that you want to run. Default is a single space.