system('cmd foo bar &')
is short for
system('/bin/sh', '-c', 'cmd foo bar &')
But you're surely asking to pass cmd, foo and bar as separate args.
We can use sh to build the command:
system('/bin/sh', '-c', '"$@" &', 'dummy', $prog, @args);
Or we can use a Perl module to build the command:
use String::ShellQuote qw( shell_quote );
system(shell_quote($prog, @args) . ' &'));
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