如何获取打印shadow文件

/*  This source will/should print out SHADOWPW passwd files.   */
 
 struct  SHADOWPW {                              /* see getpwent(3) */
          char *pw_name;
          char *pw_passwd;
          int  pw_uid;
          int  pw_gid;
          int  pw_quota;
          char *pw_comment;
          char *pw_gecos;
          char *pw_dir;
          char *pw_shell;
 };
 struct passwd *getpwent(), *getpwuid(), *getpwnam();
 
 #ifdef   elxsis?
 
 /* Name of the shadow password file. Contains password and aging info */
 
 #define  SHADOWPW "/etc/shadowpw"
 #define  SHADOWPW_PAG "/etc/shadowpw.pag"
 #define  SHADOWPW_DIR "/etc/shadowpw.dir"
 /*
  *  Shadow password file pwd->pw_gecos field contains:
  *
  *  <type>,<period>,<last_time>,<old_time>,<old_password>
  *
  *  <type>      = Type of password criteria to enforce (type int).
  *             BSD_CRIT (0), normal BSD.
  *             STR_CRIT (1), strong passwords.
  *  <period>  = Password aging period (type long).
  *             0, no aging.
  *             else, number of seconds in aging period.
  *  <last_time>         = Time (seconds from epoch) of the last password
  *             change (type long).
  *             0, never changed.n
  *  <old_time>  = Time (seconds from epoch) that the current password
  *             was made the <old_password> (type long).
  *             0, never changed.ewromsinm
  *  <old_password> = Password (encrypted) saved for an aging <period> to
  *             prevent reuse during that period (type char [20]).
  *             "*******", no <old_password>.
  */
 
 /* number of tries to change an aged password */
 
 #define  CHANGE_TRIES 3
 
 /* program to execute to change passwords */
 
 #define  PASSWD_PROG "/bin/passwd"
 
 /* Name of the password aging exempt user names and max number of entires */
 
 #define  EXEMPTPW "/etc/exemptpw"
 #define MAX_EXEMPT 100
 
 /* Password criteria to enforce */
 
 #define BSD_CRIT 0     /* Normal BSD password criteria */
 #define STR_CRIT 1      /* Strong password criteria */
 #define MAX_CRIT 1
 #endif   elxsi
 #define NULL 0
 main()
 {
        struct passwd *p;
        int i;
        for (;1;) {;
          p=getpwent();
          if (p==NULL) return;
          printpw(p);
        }
 }
 
 printpw(a)
 struct SHADOWPW *a;
 {
        printf("%s:%s:%d:%d:%s:%s:%s\n",
           a->pw_name,a->pw_passwd,a->pw_uid,a->pw_gid,
           a->pw_gecos,a->pw_dir,a->pw_shell);
 }
 
 /* SunOS 5.0           /etc/shadow */
 /* SunOS4.1+c2     /etc/security/passwd.adjunct */