create a lib to handle generic things

[guedes]

Today pgvm is all in bash, but talking with @fabriziomello, @lhcezar and @fike, we think that this could be split into more layers. The actual internal file structure is stable and this could be a good signal to create a plumbing lib.

[fike]

How think implementation? I think two ways:

1 - Adapt builtin commands and options to Bourne Shell (sh). Probably will have the codeline is much more or more pipes. (I think was in the past but I have that test again)

2 - Create new function that make the translation between shell implementations or similar strategy. Which are supported?

• bash

• ksh

• sh

• zsh

  Now, I prefer first option but I think more discussion. :)