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xiakeyou@ubuntu:~/myprogram$ gcc systemtest.c -o systemtest
xiakeyou@ubuntu:~/myprogram$ ./systemtest
/home/d/e/xiakeyou
xiakeyou@ubuntu:~/myprogram$

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xiakeyou@ubuntu:~/myprogram$ vim popentest.c
xiakeyou@ubuntu:~/myprogram$ gcc popentest.c -o popentest
xiakeyou@ubuntu:~/myprogram$ ./popentest
/home/d/e/xiakeyou
xiakeyou@ubuntu:~/myprogram$
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