> perl_src.c_pl ${fl} || { echo "$?, wrong;"; }
Can't use an undefined value as a symbol reference at ./perl_src.c_pl line 254, <$sdx> line 1013.
2, wrong;
>
>   # now execute the same command by the C-with system();
> t_sys "perl_src.c_pl ${fl} || { echo \"$?, wrong;\"; } "
Can't use an undefined value as a symbol reference at perl_src.c_pl line 254, <$sdx> line 1013.
0, wrong;

 executed command: perl_src.c_pl ../data/sdx4-1K.dat || { echo "0, wrong;"; }
 RETURN: 0
>

> cat t_sys.c
#include <stdio.h>
main ( int argc, char* argv[] )
{
  char *cmd=argv[1];
  int rt=system(cmd);
  printf ("\n executed command: %s\n RETURN: %d\n", cmd, rt);
}
>