setpwent
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小牛编辑
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2023-12-01
描述 (Description)
此函数将枚举设置(或重置)到密码条目集的开头。 应在第一次调用getpwent之前调用此函数。
语法 (Syntax)
以下是此函数的简单语法 -
setpwent
返回值 (Return Value)
此函数不返回任何值。
例子 (Example)
以下是显示其基本用法的示例代码 -
#!/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;
执行上述代码时,会产生以下结果 -
Name = root
Password = x
UID = 0
GID = 0
Quota =
Comment =
Gcos = root
HOME DIR = /root
Shell = /bin/bash
Name = 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