lipc1 doc: ps command

Linux/LPIC1/16-ps.md

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+# ⚙️ PS Command
+
+The `ps` (process status) command is used to **view running processes** on a Linux system. It’s useful for monitoring and troubleshooting tasks.
+
+---
+
+## 🧾 Basic Usage
+
+### 🔍 Show tasks in the current shell
+
+```bash
+ps
+```
+
+### 🔍 Show tasks in the current shell with **full info**
+
+```bash
+ps -f
+```
+
+---
+
+## 🌍 View System-Wide Processes
+
+### 📋 Show **all** processes
+
+```bash
+ps -A
+# or
+ps -e
+```
+
+---
+
+### 👤 Show tasks by **specific user**
+
+```bash
+ps -u <username>
+```
+
+📌 Replace `<username>` with the actual user name.
+
+---
+
+### 📊 Show **detailed info for all** tasks
+
+```bash
+ps aux
+```
+
+---
+
+## 📘 Output Fields Explained
+
+| Column    | Description                                        |
+| --------- | -------------------------------------------------- |
+| `USER`    | Owner of the process (often `root` or your user)   |
+| `PID`     | Process ID                                         |
+| `%CPU`    | CPU usage percentage                               |
+| `%MEM`    | Memory usage percentage                            |
+| `STAT`    | Process state: `R` (running), `S` (sleeping), etc. |
+| `START`   | Time when the process started                      |
+| `TIME`    | Total CPU time used                                |
+| `COMMAND` | Command that started the process                   |
+