# PV的使用

PV 全命為 Pipe Viewer ，利用它我們可以查看到命令執行的進度。

用法：pv \[OPTION] \[FILE] ...

將FILE（或標準輸入）連接到標準輸出，監督。

## **使用pv 命令監控Linux 命令的執行進度**

### **複製文件**

```
pv xxx.iso > aaa.iso
```

### **複製文件（限速2MB/s）** \*

```
pv -L 2m xxx.iso > aaa.iso
```

###  顯示ssh傳輸的network throughput

```
yes|pv|ssh 120.115.4.238 "cat > /dev/null"
```

### 顯示進度條的同時計算**/ etc / hosts**文件中的行數，字數和字節數，請在下面運行此命令

```
pv -p /etc/hosts | wc
```

```
tar -czf - ./Downloads/ | (pv -p --timer --rate --bytes > backup.tgz)
tar -czf - ./Documents/ | (pv -n > backup.tgz) 2>&1 | dialog --gauge "Progress" 10 70
```

從/ var / log / syslog文件製作一個zip文件，請運行以下命令

```
pv /var/log/syslog | zip > syslog.zip
```


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