Linux/UNIX Easy date manipulation with yest

Sometime it is necessary to run a command or script on the last day of a month. There is old good hack that will decide whether tomorrow is the first day of the next month.

All
these years I was using *dirty shell script hacks* to create my own
date manipulation utilities for backups and other admin task. Thanks to
this project no more dirty work.

yest is highly recommended tool for all seasoned UNIX admin.