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[root@ test]$ cat return10.c
#include <stdio.h>
int main(int argc, char *argv[]){
return 10;
}
[root@ test]$ perl -e 'print system("/path_to_return10")'
2560
I was expecting 10 but got 2560,why?
See
$?in perldoc perlvar.You got 10 * 256 (return value = 10) + 0 * 128 (there was no core dump) + 0 (process wasn’t killed by signal).