Make sure you also know the difference between...
[tt] . /path/to/script.ksh[/tt]
...and...
[tt] /path/to/script.ksh[/tt]
The dot with a space after it means to run the commands in the script in THIS process. Otherwise it will create a separate subprocess to run the script in. Running it with the dot is called "sourcing" it.
The biggest difference is that if the script is going to be setting some environment variables that you want to be set when it's done, you have to source it to run it (that is, use the "dot space").
If you run the script without the dot, it will run the script, and possible set environment variables, but when the script ends, those variables are gone because they were only set for that process that was created to run the script.
Another thing is that when sourced, or run with a dot, the she-bang line (#!/bin/ksh) isn't used. It's just a comment. so you have to make sure you're running it in the correct shell.
