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6.1 使用获取阴影文件口令的函数
6.2 使用getpwnam函数获取结构体spwd;
6.3
#include <apue.h>
#include <sys/utsname.h>
int main(){
<span style="white-space:pre"> </span>struct utsname buf;
<span style="white-space:pre"> </span>int re;
<span style="white-space:pre"> </span>if((re=uname(&buf))==-1)
<span style="white-space:pre"> </span>err_sys("uname error");
<span style="white-space:pre"> </span>printf("operating system:%s node:%s release:%s version:%smachine:%s\n",buf.sysname,buf.nodename,buf.release,buf.version,buf.machine);
<span style="white-space:pre"> </span>exit(0);
}