(gdb) bt
#0  Perl_do_tell (my_perl=0x9c01008, gv=0x0) at doio.c:1038
#1  0x080fac6a in Perl_pp_tell (my_perl=0x9c01008) at pp_sys.c:2077
#2  0x080b20f9 in Perl_runops_standard (my_perl=0x9c01008) at run.c:38
#3  0x080b0560 in perl_run (my_perl=0x9c01008) at perl.c:2391
#4  0x08063ebd in main (argc=3, argv=0xbfff4dd4, env=0xbfff4de4)
    at perlmain.c:113