@code{substitute-in-file-name} to perform them (@pxref{File Name
Expansion}).
+ Executing a program can also try adding suffixes to the specified
+name:
+
+@defvar exec-suffixes
+This variable is a list of suffixes (strings) to try adding to the
+specified program file name. The list should include @code{""} if you
+want the name to be tried exactly as specified. The default value is
+system-dependent.
+@end defvar
+
Each of the subprocess-creating functions has a @var{buffer-or-name}
argument which specifies where the standard output from the program will
go. It should be a buffer or a buffer name; if it is a buffer name,