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sources/tech/20210811 Monitor your Linux system in your terminal with procps-ng.md
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[#]: subject: "Monitor your Linux system in your terminal with procps-ng"
[#]: via: "https://opensource.com/article/21/8/linux-procps-ng"
[#]: author: "Seth Kenlon https://opensource.com/users/seth"
[#]: collector: "lujun9972"
[#]: translator: "geekpi"
[#]: reviewer: " "
[#]: publisher: " "
[#]: url: " "
Monitor your Linux system in your terminal with procps-ng
======
How to find the process ID (PID) of a program. The most common Linux
tools for this are provided by the procps-ng package, including the ps
and pstree, pidof, and pgrep commands.
![System monitor][1]
A process, in [POSIX][2] terminology, is an ongoing event being managed by an operating system’s kernel. A process is spawned when you launch an application, although there are many other processes running in the background of your computer, including programs to keep your system time accurate, to monitor for new filesystems, to index files, and so on.
Most operating systems have a system activity monitor of some kind so you can learn what processes are running at any give moment. Linux has a few for you to choose from, including GNOME System Monitor and KSysGuard. Both are useful applications on the desktop, but Linux also provides the ability to monitor your system in your terminal. Regardless of which you choose, it’s a common task for those who take an active role in managing their computer is to examine a specific process.
In this article, I demonstrate how to find the process ID (PID) of a program. The most common tools for this are provided by the [procps-ng][3] package, including the `ps` and `pstree`, `pidof`, and `pgrep` commands.
### Find the PID of a running program
Sometimes you want to get the process ID (PID) of a specific application you know you have running. The `pidof` and `pgrep` commands find processes by command name.
The `pidof` command returns the PIDs of a command, searching for the exact command by name:
```
$ pidof bash
1776 5736
```
The `pgrep` command allows for regular expressions (regex):
```
$ pgrep .sh
1605
1679
1688
1776
2333
5736
$ pgrep bash
5736
```
### Find a PID by file
You can find the PID of the process using a specific file with the `fuser` command.
```
$ fuser --user ~/example.txt                    
/home/tux/example.txt:  3234(tux)
```
### Get a process name by PID
If you have the PID _number_ of a process but not the command that spawned it, you can do a "reverse lookup" with `ps`:
```
$ ps 3234
 PID TTY      STAT   TIME COMMAND
5736 pts/1    Ss     0:00 emacs
```
### List all processes
The `ps` command lists processes. You can list every process on your system with the `-e` option:
```
$ ps -e | less
PID TTY          TIME CMD
  1 ?        00:00:03 systemd
  2 ?        00:00:00 kthreadd
  3 ?        00:00:00 rcu_gp
  4 ?        00:00:00 rcu_par_gp
  6 ?        00:00:00 kworker/0:0H-events_highpri
[...]
5648 ?        00:00:00 gnome-control-c
5656 ?        00:00:00 gnome-terminal-
5736 pts/1    00:00:00 bash
5791 pts/1    00:00:00 ps
5792 pts/1    00:00:00 less
(END)
```
### List just your processes
The output of `ps -e` can be overwhelming, so use `-U` to see the processes of just one user:
```
$ ps -U tux | less
 PID TTY          TIME CMD
3545 ?        00:00:00 systemd
3548 ?        00:00:00 (sd-pam)
3566 ?        00:00:18 pulseaudio
3570 ?        00:00:00 gnome-keyring-d
3583 ?        00:00:00 dbus-daemon
3589 tty2     00:00:00 gdm-wayland-ses
3592 tty2     00:00:00 gnome-session-b
3613 ?        00:00:00 gvfsd
3618 ?        00:00:00 gvfsd-fuse
3665 tty2     00:01:03 gnome-shell
[...]
```
That produces 200 fewer (give or take a hundred, depending on the system you're running it on) processes to sort through.
You can view the same output in a different format with the `pstree` command:
```
$ pstree -U tux -u --show-pids
[...]
├─gvfsd-metadata(3921)─┬─{gvfsd-metadata}(3923)
│                      └─{gvfsd-metadata}(3924)
├─ibus-portal(3836)─┬─{ibus-portal}(3840)
│                   └─{ibus-portal}(3842)
├─obexd(5214)
├─pulseaudio(3566)─┬─{pulseaudio}(3640)
│                  ├─{pulseaudio}(3649)
│                  └─{pulseaudio}(5258)
├─tracker-store(4150)─┬─{tracker-store}(4153)
│                     ├─{tracker-store}(4154)
│                     ├─{tracker-store}(4157)
│                     └─{tracker-store}(4178)
└─xdg-permission-(3847)─┬─{xdg-permission-}(3848)
                        └─{xdg-permission-}(3850)
```
### List just your processes with context
You can see extra context for all of the processes you own with the `-u` option.
```
$ ps -U tux -u
USER  PID %CPU %MEM    VSZ   RSS TTY STAT START  TIME COMMAND
tux  3545  0.0  0.0  89656  9708 ?   Ss   13:59  0:00 /usr/lib/systemd/systemd --user
tux  3548  0.0  0.0 171416  5288 ?   S    13:59  0:00 (sd-pam)
tux  3566  0.9  0.1 1722212 17352 ?  S<sl 13:59  0:29 /usr/bin/pulseaudio [...]
tux  3570  0.0  0.0 664736  8036 ?   SLl  13:59  0:00 /usr/bin/gnome-keyring-daemon [...]
[...]
tux  5736  0.0  0.0 235628  6036 pts/1 Ss 14:18  0:00 bash
tux  6227  0.0  0.4 2816872 74512 tty2 Sl+14:30  0:00 /opt/firefox/firefox-bin [...]
tux  6660  0.0  0.0 268524  3996 pts/1 R+ 14:50  0:00 ps -U tux -u
tux  6661  0.0  0.0 219468  2460 pts/1 S+ 14:50  0:00 less
```
### Troubleshoot with PIDs
If you’re having trouble with a specific application, or you’re just curious about what else on your system an application uses, you can see a memory map of the running process with `pmap`:
```
$ pmap 1776
5736:   bash
000055f9060ec000   1056K r-x-- bash
000055f9063f3000     16K r---- bash
000055f906400000     40K rw---   [ anon ]
00007faf0fa67000   9040K r--s- passwd
00007faf1033b000     40K r-x-- libnss_sss.so.2
00007faf10345000   2044K ----- libnss_sss.so.2
00007faf10545000      4K rw--- libnss_sss.so.2
00007faf10546000 212692K r---- locale-archive
00007faf1d4fb000   1776K r-x-- libc-2.28.so
00007faf1d6b7000   2044K ----- libc-2.28.so
00007faf1d8ba000      8K rw--- libc-2.28.so
[...]
```
### Process IDs
The **procps-ng** package has all the commands you need to investigate and monitor what your system is using at any moment. Whether you’re just curious about how all the disparate parts of a Linux system fit together, or whether you’re investigating an error, or you’re looking to optimize how your computer is performing, learning these commands gives you a significant advantage for understanding your OS.
--------------------------------------------------------------------------------
via: https://opensource.com/article/21/8/linux-procps-ng
作者：[Seth Kenlon][a]
选题：[lujun9972][b]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/seth
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/system-monitor-splash.png?itok=0UqsjuBQ (System monitor)
[2]: https://opensource.com/article/19/7/what-posix-richard-stallman-explains
[3]: https://gitlab.com/procps-ng

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@ -0,0 +1,196 @@
[#]: subject: "Monitor your Linux system in your terminal with procps-ng"
[#]: via: "https://opensource.com/article/21/8/linux-procps-ng"
[#]: author: "Seth Kenlon https://opensource.com/users/seth"
[#]: collector: "lujun9972"
[#]: translator: "geekpi"
[#]: reviewer: " "
[#]: publisher: " "
[#]: url: " "
用 procps-ng 在终端监控你的 Linux 系统
======
如何找到一个程序的进程 ID（PID）。最常见的 Linux 工具是由 procps-ng 包提供的，包括 ps、pstree、pidof 和 pgrep 命令。
![System monitor][1]
在[POSIX][2]术语中，进程是一个正在进行的事件，由操作系统的内核管理。当你启动一个应用时就会产生一个进程，尽管还有许多其他的进程在你的计算机后台运行，包括保持系统时间准确的程序，监测新的文件系统，索引文件，等等。
大多数操作系统都有某种类型的系统活动监视器，因此你可以了解在任何特定时刻有哪些进程在运行。Linux 有一些供你选择，包括 GNOME 系统监视器和 KSysGuard。这两个软件在桌面上都很有用，但 Linux 也提供了在终端监控系统的能力。不管你选择哪一种，对于那些积极管理自己电脑的人来说，检查一个特定的进程是一项常见的任务。
在这篇文章中，我演示了如何找到一个程序的进程 ID（PID）。最常见的工具是由 [procps-ng][3] 包提供的，包括 `ps`、`pstree`、`pidof` 和 `pgrep` 命令。
### 查找一个正在运行的程序的 PID
有时你想得到一个你知道正在运行的特定程序的进程 ID（PID）。`pidof` 和 `pgrep` 命令通过命令名称查找进程。
`pidof` 命令返回一个命令的 PID，按名称搜索确切的命令：
```
$ pidof bash
1776 5736
```
`pgrep` 命令允许使用正则表达式（regex）：
```
$ pgrep .sh
1605
1679
1688
1776
2333
5736
$ pgrep bash
5736
```
### 通过文件查找 PID
你可以用 `fuser` 命令找到使用特定文件的进程的 PID。
```
$ fuser --user ~/example.txt
/home/tux/example.txt: 3234(tux)
```
### 通过 PID 获得进程名称
如果你有一个进程的 PID _编号_，但没有生成它的命令，你可以用 `ps` 做一个“反向查找”：
```
$ ps 3234
PID TTY STAT TIME COMMAND
5736 pts/1 Ss 0:00 emacs
```
### 列出所有进程
`ps` 命令列出进程。你可以用 `-e` 选项列出你系统上的每一个进程：
```
$ ps -e | less
PID TTY TIME CMD
1 ? 00:00:03 systemd
2 ? 00:00:00 kthreadd
3 ? 00:00:00 rcu_gp
4 ? 00:00:00 rcu_par_gp
6 ? 00:00:00 kworker/0:0H-events_highpri
[...]
5648 ? 00:00:00 gnome-control-c
5656 ? 00:00:00 gnome-terminal-
5736 pts/1 00:00:00 bash
5791 pts/1 00:00:00 ps
5792 pts/1 00:00:00 less
(END)
```
### 只列出你的进程
`ps -e` 的输出可能会让人不知所措，所以使用 `-U` 来查看一个用户的进程：
```
$ ps -U tux | less
PID TTY TIME CMD
3545 ? 00:00:00 systemd
3548 ? 00:00:00 (sd-pam)
3566 ? 00:00:18 pulseaudio
3570 ? 00:00:00 gnome-keyring-d
3583 ? 00:00:00 dbus-daemon
3589 tty2 00:00:00 gdm-wayland-ses
3592 tty2 00:00:00 gnome-session-b
3613 ? 00:00:00 gvfsd
3618 ? 00:00:00 gvfsd-fuse
3665 tty2 00:01:03 gnome-shell
[...]
```
这样就减少了 200 个(可能是 100 个，取决于你运行的系统)需要分类的进程。
你可以用 `pstree` 命令以不同的格式查看同样的输出：
```
$ pstree -U tux -u --show-pids
[...]
├─gvfsd-metadata(3921)─┬─{gvfsd-metadata}(3923)
│ └─{gvfsd-metadata}(3924)
├─ibus-portal(3836)─┬─{ibus-portal}(3840)
│ └─{ibus-portal}(3842)
├─obexd(5214)
├─pulseaudio(3566)─┬─{pulseaudio}(3640)
│ ├─{pulseaudio}(3649)
│ └─{pulseaudio}(5258)
├─tracker-store(4150)─┬─{tracker-store}(4153)
│ ├─{tracker-store}(4154)
│ ├─{tracker-store}(4157)
│ └─{tracker-store}(4178)
└─xdg-permission-(3847)─┬─{xdg-permission-}(3848)
└─{xdg-permission-}(3850)
```
### 列出进程的上下文
你可以用 `-u` 选项查看你拥有的所有进程的额外上下文。
```
$ ps -U tux -u
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
tux 3545 0.0 0.0 89656 9708 ? Ss 13:59 0:00 /usr/lib/systemd/systemd --user
tux 3548 0.0 0.0 171416 5288 ? S 13:59 0:00 (sd-pam)
tux 3566 0.9 0.1 1722212 17352 ? S<sl 13:59 0:29 /usr/bin/pulseaudio [...]
tux 3570 0.0 0.0 664736 8036 ? SLl 13:59 0:00 /usr/bin/gnome-keyring-daemon [...]
[...]
tux 5736 0.0 0.0 235628 6036 pts/1 Ss 14:18 0:00 bash
tux 6227 0.0 0.4 2816872 74512 tty2 Sl+14:30 0:00 /opt/firefox/firefox-bin [...]
tux 6660 0.0 0.0 268524 3996 pts/1 R+ 14:50 0:00 ps -U tux -u
tux 6661 0.0 0.0 219468 2460 pts/1 S+ 14:50 0:00 less
```
### 用 PID 排除故障
如果你在某个特定的程序上有问题，或者你只是好奇某个程序在你的系统上还使用了什么，你可以用 `pmap` 查看运行中的进程的内存图。
```
$ pmap 1776
5736: bash
000055f9060ec000 1056K r-x-- bash
000055f9063f3000 16K r---- bash
000055f906400000 40K rw--- [ anon ]
00007faf0fa67000 9040K r--s- passwd
00007faf1033b000 40K r-x-- libnss_sss.so.2
00007faf10345000 2044K ----- libnss_sss.so.2
00007faf10545000 4K rw--- libnss_sss.so.2
00007faf10546000 212692K r---- locale-archive
00007faf1d4fb000 1776K r-x-- libc-2.28.so
00007faf1d6b7000 2044K ----- libc-2.28.so
00007faf1d8ba000 8K rw--- libc-2.28.so
[...]
```
### 处理进程 ID
**procps-ng** 软件包有你需要的所有命令，以调查和监控你的系统在任何时候的使用情况。无论你是对 Linux 系统中所有分散的部分如何结合在一起感到好奇，还是对一个错误进行调查，或者你想优化你的计算机的性能，学习这些命令都会为你了解你的操作系统提供一个重要的优势。
--------------------------------------------------------------------------------
via: https://opensource.com/article/21/8/linux-procps-ng
作者：[Seth Kenlon][a]
选题：[lujun9972][b]
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/seth
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/system-monitor-splash.png?itok=0UqsjuBQ (System monitor)
[2]: https://opensource.com/article/19/7/what-posix-richard-stallman-explains
[3]: https://gitlab.com/procps-ng