I don't see what the point of this is. Every single command can be mapped to an existing Unix tool.
## Why use this instead of ls/grep/wget/etc?
Posce is one app using one system on one directory. It's a very focused app, and that focus gives it a level of stability and uniformity I enjoy. Also, by using a single notes directory, you can use disambiguated names and get incredible brevity when entering commands.