file_exist

          return 1 if filename exists, 0 if not

          file handling

          file_exist(filename)

          filename: name of file

          none

          none

          1 if filename exists, 0 if not

          none

          none

          one LUN is temporarily used

          none

          an attempt to open the file with a read is undertaken, if
          the attempt succeeds, the file exists.

          if (file_exist("/etc/services")) then begin
             print,'/etc/services exists'
          endif

          Version 1.0, 1997/10/06, Joern Wilms

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