progress is a utility used in a pipe to report the progress of data transfer to standard error. Command-line arguments specify how frequently to report, what character to use to report, and how much buffering to do.
progress是一个实用程序,用于一个程序管道来报告到标准错误的数据传输过程。命令行参数专门负责报告的频率,用什么字符报道,做多少缓冲。