use Shell qw(oggenc);

# ("bar.wav" doesn't exist, so errors of the form "cannot open input file
# 'bar.wav' indicate the command is being parsed correctly.  "Multiple input
# files" type errors indicate that the spaced argument is being seen as two.)

# All the system() calls work...
# ERROR: Cannot open input file "bar.wav": No such file or directory
system("oggenc -o foo.ogg -c " . quotemeta("composer=J. Random Hacker") .  " bar.wav");
# ERROR: Cannot open input file "bar.wav": No such file or directory
system("oggenc", "-o", "foo.ogg", "-c", "composer=J. Random Hacker", "bar.wav");

# None of the Shell.pm ones do.
# ERROR: Multiple input files with specified output filename: suggest using -n
oggenc("-o", "foo.ogg", "-c", "composer=J. Random Hacker", "bar.wav");
# ERROR: Multiple input files with specified output filename: suggest using -n
oggenc("-o", "foo.ogg", "-c", quotemeta("composer=J. Random Hacker"), "bar.wav");
# ERROR: Multiple input files with specified output filename: suggest using -n
oggenc("-o foo.ogg -c " . quotemeta("composer=J. Random Hacker") . " bar.wav");