MySQL Dump command piped into PV with estimated progress
mysqldump -u root --all-databases -q -e --add-locks | pv --progress --size 26g -t -e -r -a > dump.sql;
mysqldump -u root -p DATABASE | pv | gzip -c > commentsys.sql.gz;
gzip -d backup-20100910164109.sql.gz
tar -zxvf archive.tar.gz
tar -zcf archive-name.tar.gz foldername/