Perl setpwent 函数

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  描述

  setpwent 将枚举设置（或重置）到密码条目集的开头。应该在第一次调用getpwent之前调用此函数。
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  句法

  以下是此函数的简单语法-

  
  setpwent
  

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  返回值

  此函数不返回任何值。
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  示例

  以下是显示其基本用法的示例代码-

   
  while(($name, $passwd, $uid, $gid, $quota, $comment, $gcos, $dir, 
     $shell) = getpwent()) {
     print "Name = $name\n";
     print "Password = $passwd\n";
     print "UID = $uid\n";
     print "GID = $gid\n";
     print "Quota = $quota\n";
     print "Comment = $comment\n";
     print "Gcos = $gcos\n";
     print "HOME DIR = $dir\n";
     print "Shell = $shell\n";
  }
  
  setpwent() ; # Rewind the databse /etc/passwd
  
  while(($name, $passwd, $uid, $gid, $quota, $comment, $gcos, $dir, 
     $shell) = getpwent()) {
     print "Name = $name\n";
     print "Password = $passwd\n";
     print "UID = $uid\n";
     print "GID = $gid\n";
     print "Quota = $quota\n";
     print "Comment = $comment\n";
     print "Gcos = $gcos\n";
     print "HOME DIR = $dir\n";
     print "Shell = $shell\n";
  }
  
  endpwent(); # Closes the database;
  

  尝试一下

  执行以上代码后，将产生以下结果--

  
  Name = root
  Password = x
  UID = 0
  GID = 0
  Quota = 
  Comment = 
  Gcos = root
  HOME DIR = /root
  Shell = /bin/bash
  Name = daemon
  Password = x
  UID = 1
  GID = 1
  Quota = 
  Comment = 
  Gcos = daemon
  HOME DIR = /usr/sbin
  Shell = /usr/sbin/nologin
  Name = bin
  Password = x
  UID = 2
  GID = 2
  Quota = 
  Comment = 
  Gcos = bin
  HOME DIR = /bin
  Shell = /usr/sbin/nologin
  Name = sys
  Password = x
  UID = 3
  GID = 3
  Quota = 
  Comment = 
  Gcos = sys
  HOME DIR = /dev
  Shell = /usr/sbin/nologin
  Name = sync
  Password = x
  UID = 4
  GID = 65534
  Quota = 
  Comment = 
  Gcos = sync
  HOME DIR = /bin
  ............