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pgrep
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===
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设置用户的认证信息，包括用户密码、密码过期时间等
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## 说明
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**pgrep命令** 以名称为依据从运行进程队列中查找进程，并显示查找到的进程id。每一个进程ID以一个十进制数表示，通过一个分割字符串和下一个ID分开，默认的分割字符串是一个新行。对于每个属性选项，用户可以在命令行上指定一个以逗号分割的可能值的集合
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## 选项
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```
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pgrep(选项)(参数)
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```
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```
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-o：仅显示找到的最小（起始）进程号
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-n：仅显示找到的最大（结束）进程号
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-l：显示进程名称
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-P：指定父进程号
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-g：指定进程组
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-t：指定开启进程的终端
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-u：指定进程的有效用户ID
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```
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### 参数
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进程名称：指定要查找的进程名称，同时也支持类似grep指令中的匹配模式
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## 实例
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```
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pgrep -lo httpd
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4557 httpd
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[root@localhost ~]# pgrep -ln httpd
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4566 httpd
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[root@localhost ~]# pgrep -l httpd
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4557 httpd
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4560 httpd
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4561 httpd
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4562 httpd
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4563 httpd
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4564 httpd
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4565 httpd
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4566 httpd
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[root@localhost ~]# pgrep httpd 4557
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4560
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4561
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4562
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4563
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4564
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4565
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4566
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```
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