刚学了perl,用它写的统计pv的脚本，这个要结合 一个shell脚本，先用shell脚本生成一个文件，然后用perl脚本读入这个文本文件。-Just learn perl, use it to write the scr ipt of statistical pv, this should be combined with a shell scr ipt, first with the shell scr ipt generates a file, and then use perl scr ipt that reads the text file.