appendpath 1 user commands nosh
appendpath add a dir to a path environment variable then chain
`appendpath` var dir next-prog

## Description

`appendpath` is a chain-loading utility that appends the value dir to the path environment variable var, and then chain loads to next-prog with the execvp 3 function. If the environment variable is set and not empty, it inserts a colon (`:`) between the old value of var and the appended dir.

next-prog may contain its own command line options, which `appendpath` will ignore.

## Author

Jonathan de Boyne Pollard