[frink@truth ~/code/perl]$./ret-code.pl 
'true':
0x00000000
0
0
0

'false':
0x00000100
256
1
1

'nosuchprogramname':
Can't exec "nosuchprogramname": No such file or directory at ./ret-code.pl line 26.
0xFFFFFFFF
-1
16777215
255