a program under linux, we can see.

[ping\ping\addrinfo.h
.....\....\error.c
.....\....\host_serv.c
.....\....\host_serv.c.bak
.....\....\in_cksum.c
.....\....\main.c
.....\....\main.c.bak
.....\....\Makefile
.....\....\Makefile.bak
.....\....\my.h
.....\....\my.h.bak
.....\....\ping.h
.....\....\ping.h.bak
.....\....\proc_v4.c
.....\....\readline.c
.....\....\readloop.c
.....\....\readn.c
.....\....\send_v4.c
.....\....\signal.c
.....\....\sig_alrm.c
.....\....\sock_ntop_host.c
.....\....\sock_ntop_host.c.bak
.....\....\tv_sub.c
.....\....\wrapsock.c
.....\....\wrapstdio.c
.....\....\writen.c
.....\ping.h
.....\ping.c
.....\ping
[ping

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