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# pv
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## 说明
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**pv命令** Pipe Viewer 的简称，由Andrew Wood 开发。意思是通过管道显示数据处理进度的信息。这些信息包括已经耗费的时间，
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完成的百分比(通过进度条显示)，当前的速度，全部传输的数据，以及估计剩余的时间
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## 下载安装
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```bash
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sudo apt-get install pv# Debian
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yum install pv # RedHat
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```
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## 选项
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```markdown
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pv [OPTION] [FILE]...
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-p, --progress show progress bar
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-t, --timer show elapsed time
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-e, --eta show estimated time of arrival (completion)
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-I, --fineta show absolute estimated time of arrival
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(completion)
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-r, --rate show data transfer rate counter
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-a, --average-rate show data transfer average rate counter
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-b, --bytes show number of bytes transferred
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-T, --buffer-percent show percentage of transfer buffer in use
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-A, --last-written NUM show NUM bytes last written
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-F, --format FORMAT set output format to FORMAT
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-n, --numeric 输出百分比
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-q, --quiet do not output any transfer information at all
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-W, --wait display nothing until first byte transferred
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-D, --delay-start SEC display nothing until SEC seconds have passed
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-s, --size SIZE set estimated data size to SIZE bytes
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-l, --line-mode count lines instead of bytes
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-0, --null lines are null-terminated
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-i, --interval SEC update every SEC seconds
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-w, --width WIDTH assume terminal is WIDTH characters wide
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-H, --height HEIGHT assume terminal is HEIGHT rows high
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-N, --name NAME prefix visual information with NAME
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-f, --force output even if standard error is not a terminal
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-c, --cursor use cursor positioning escape sequences
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-L, --rate-limit RATE limit transfer to RATE bytes per second
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-B, --buffer-size BYTES use a buffer size of BYTES
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-C, --no-splice never use splice(), always use read/write
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-E, --skip-errors skip read errors in input
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-S, --stop-at-size stop after --size bytes have been transferred
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-R, --remote PID update settings of process PID
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-P, --pidfile FILE save process ID in FILE
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-d, --watchfd PID[:FD] watch file FD opened by process PID
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```
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## 实例
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```bash
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# 复制文件会有进度
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linux [master●] % pv ~/Downloads/CentOS-7-x86_64-Minimal-1511.iso > ~/Desktop/CentOS-7-x86_64-Minimal-1511.iso
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# -L 可以让你修改 pv 命令的传输速率,使用 -L 选项来限制传输速率为2MB/s
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pv -L 2m /media/himanshu/1AC2-A8E3/fNf.mkv > ./Desktop/fnf.mkv
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# 字符一个个匀速在命令行中显示出来
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echo "Tecmint[dot]com is a community of Linux Nerds and Geeks" | pv -qL 10
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# 压缩文件展示进度信息
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pv /media/himanshu/1AC2-A8E3/fnf.mkv | gzip > ./Desktop/fnf.log.gz
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# 用 dd 命令将 iso 写入磁盘，pv来实现进度条的显示
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sudo pv -cN source < /Users/kacperwang/Downloads/CentOS-7-x86_64-Everything-1511.iso | sudo dd of=/dev/disk2 bs=4m
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```
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