5 POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/system.html}
9 Portability problems fixed by Gnulib:
13 Portability problems not fixed by Gnulib:
16 On Windows platforms (excluding Cygwin), the command processor used by the
17 @code{system} function is @file{cmd.exe}, not @file{/bin/sh}. Accordingly,
18 the rules for quoting shell arguments containing spaces, quote or other special
19 characters are different.