Perl setpwent用法及代碼示例

描述

此函數將枚舉設置(或重置)到密碼條目集的開頭。這個函數應該在第一次調用 getpwent 之前調用。

用法

以下是此函數的簡單語法 -

setpwent

返回值

此函數不返回任何值。

示例

以下是顯示其基本用法的示例代碼 -

#!/usr/bin/perl

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;

執行上述代碼時，會產生以下結果 -

Name = root
Password = x
UID = 0
GID = 0
Quota = 
Comment = 
Gcos = root
HOME DIR = /root
Shell = /bin/bash
Name = bin
Password = x
UID = 1
GID = 1
Quota = 
Comment = 
Gcos = bin
HOME DIR = /bin
Shell = /sbin/nologin
Name = daemon
Password = x
UID = 2
GID = 2
Quota = 
Comment = 
Gcos = daemon
HOME DIR = /sbin
Shell = /sbin/nologin
.
.
.
Name = qemu
Password = x
UID = 107
GID = 107
Quota = 
Comment = 
Gcos = qemu user
HOME DIR = /
Shell = /sbin/nologin
Name = com
Password = x
UID = 501
GID = 501
Quota = 
Comment = 
Gcos = 
HOME DIR = /home/com
Shell = /bin/bash
Name = railo
Password = x
UID = 497
GID = 495
Quota = 
Comment = 
Gcos = 
HOME DIR = /opt/railo
Shell = /bin/false