安装：
sudo apt-get install task
$ task add some very important task
$ task
You can also install vit if you want an alternative UI to this list. There are also some command line tools for managing your agenda.
你也可以安装 VIT 查看内容
sudo apt-get install vit
用法：http://manpages.ubuntu.com/manpages/maverick/man1/task.1.html
官网：http://taskwarrior.org/
实例：
30 Second Tutorial
Basic usage from the 30-Second Tutorial.
$ task add Read Taskwarrior documents later
$ task add priority:H Pay bills
$ task next
$ task 2 done
$ task
$ task 1 delete
Filters
A filter is how you restrict the tasks to just those that you want to see or modify.
Show tasks I added in the last 4 days.
$ task entry.after:today-4days list
Show tasks I added yesterday.
$ task entry:yesterday list
Show tasks I added in the last hour.
$ task entry.after:now-1hour list
Show tasks I completed between a date range.
$ task end.after:2015-05-01 and end.before:2015-05-31 completed
Show tasks I completed in the last week.
$ task end.after:today-1wk completed
Show tasks in This project or That project.
$ task project:This or project:That list
更多：http://taskwarrior.org/docs/examples.html
完整文档：http://taskwarrior.org/docs/