SAM is a command-line tool (for Slackware Linux) which uses a stack to provide control of the PATH variable and the currently defined set of environment variables and functions.  To do this it uses a set of executable scripts, functions and compiled code.  The result is a command-line environment that changes the way you see and thus changes the way you think.  It has helped me to write more and better shell code; perhaps it will help you also.

Click in the menu at the left to learn more about SAM or to download the distribution