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feat: add prtstat.md (#491)
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LinuxZilong committed Apr 27, 2023
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prtstat
===

显示进程信息

## 概要

```shell
prtstat [-r|--raw] pid
prtstat -V|--version
```

## 主要用途

- prtstat打印指定进程的统计信息。这个信息来自/proc/PID/stat文件。


## 参数

-r:以原始(raw)格式打印进程的统计信息

-V: 打印prtstat的版本信息

## 例子

```shell
[root@localhost command]# ps -ef|grep nginx
root 4022 250867 0 16:39 pts/1 00:00:00 grep --color=auto nginx
root 224312 1 0 4月26 ? 00:00:00 nginx: master process /var/openresty/nginx/sbin/nginx
nobody 224313 224312 0 4月26 ? 00:00:00 nginx: worker process
[root@localhost command]# prtstat -r 224312
pid: 224312 comm: nginx
state: S ppid: 1
pgrp: 224312 session: 224312
tty_nr: 0 tpgid: -1
flags: 402040 minflt: 110
cminflt: 0 majflt: 0
cmajflt: 0 utime: 0
stime: 0 cutime: 0
cstime: 0 priority: 20
nice: 0 num_threads: 1
itrealvalue: 0 starttime: 6271470
vsize: 56369152 rss: 413
rsslim: 18446744073709551615 startcode: 4194304
endcode: 5772276 startstack: 140722783765648
kstkesp: 7FFC9389BFB8 kstkeip: 7F25CD42F6C6
wchan: 18446744071885754297 nswap: 0
cnswap: 18446744071885754297 exit_signal: 17
processor: 2 rt_priority: 0
policy: 0 delayaccr_blkio_ticks: 0
guest_time: 0 cguest_time: 0
```

### 注意

1. `prtstat`命令来自于psmisc包。此包来自于base源仓库。
2. psmisc.x86_64 : 用于管理系统上进程的实用程序

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