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pgrep
===
设置用户的认证信息,包括用户密码、密码过期时间等
## 说明
**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
## 选项
```
pgrep(选项)(参数)
```
```
-o仅显示找到的最小起始进程号
-n仅显示找到的最大结束进程号
-l显示进程名称
-P指定父进程号
-g指定进程组
-t指定开启进程的终端
-u指定进程的有效用户ID
```
### 参数
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
## 实例
```
pgrep -lo httpd
4557 httpd
[root@localhost ~]# pgrep -ln httpd
4566 httpd
[root@localhost ~]# pgrep -l httpd
4557 httpd
4560 httpd
4561 httpd
4562 httpd
4563 httpd
4564 httpd
4565 httpd
4566 httpd
[root@localhost ~]# pgrep httpd 4557
4560
4561
4562
4563
4564
4565
4566
```