This post appeared originally in our sysadvent series and has been moved here following the discontinuation of the sysadvent microsite
pv is a nice little tool that will take stdin and make a nice little
progress bar and displaying time elapsed, percentage completed (if size is known)
current throughput rate and the total data transferred and with an ETA.
So if you have a tool that can output it’s result on standard output or read from standard input, one can get a progress bar!
It’s nice to know that “data is flowing”.
Other examples
Send file with Netcat and get a nice progress-bar:
pv file | nc -w 1 example.com 3000
Get progress bar on tar output:
tar zcf - /directory | pv > backup.tar.gz
MySQL dump/restore:
mysqldump database | pv > database.sql
pv database.sql | mysql database
Limit the transfer rate and size of data over a pipe
cat /dev/zero | pv -L 3m -Ss 100m > /dev/null
Lombok – avoid getting burned by the boilerplate
Executive summary
This blog describes briefly the most commonly used annotations of the code generation tool Lombok which shields the Java developer from having to generate or write so called ‘boilerplate code’. It begins with explaining that term and the problems it may cause, continues with a brief setup description of a Maven based Java project that incorporates Lombok and then display some useful annotations.
These annotations are grouped after function such as object creation, field access, some methods ... [continue reading]