Pipe Viewer is a terminal-based tool for monitoring the progress of data through a pipeline.
wget http://pipeviewer.googlecode.com/files/pv-1.2.0-1.i386.rpm sudo rpm -i pv-1.2.0-1.i386.rpm
other version : http://en.sourceforge.jp/projects/freshmeat_pv/releases/
% pv --version pv 1.2.0 - Copyright(C) 2010 Andrew Wood <firstname.lastname@example.org> Web site: http://www.ivarch.com/programs/pv.shtml This program is free software, and is being distributed under the terms of the Artistic License 2.0. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
How to use pv
don't use pv.
% gzip access.log > access.log.gz
% pv access.log | gzip > access.log.gz 520MB 0:00:08 [65.1MB/s] [================> ] 28% ETA 0:00:19
% man pv