Which .bash does "do shell script" commands use?

The "do shell script" command uses the Bourne shell "sh". But I am curious to know which .bash it uses to define the shell environment variables.
I ran into a problem installing a third-party unix program which required new environment variables to be defined in order to execute. Defining these variables and executing this program from the terminal worked fine.
But executing it within a "do shell script" command in an Applescript - the program died silently because the environment variables it required were not defined in the shell Applescript uses. It appears to invoke a new shell which does not inherit the environment variables defined in your home user shell.
(I found this out by 'do shell script "set"' which listed the environment variables Applescript knows about - the ones I defined for the third-party program were not listed).
A "brute force" way of fixing this is to pass the environment variables directly:
do shell script "export THIRDPARTY_ENVVAR=blah; /usr/sbin/thirdpartyprogam"
This works but not exactly elegant, particularly when you need to pass a number of variables.
So - any better ways to do this? Can I edit the .bash Applescript uses, and where is it?
Thanks.

Another option that might work for you... if you are saving/distributing your AppleScript as an "Application bundler" is to group all your shell env. variables and other commands into a separate shell script file. Then include the shell script inside your app bundle. Locate the shell script at runtime and run that with "do shell script".
For example, create "myShellScript.sh"
#!/bin/sh
export THIRDPARTY_ENVVAR=blah
# ... more variable declarations..
/usr/sbin/thirdpartyprogam
# ... more shell commands...
Store the shell script file inside your AppleScript bundle's Contents -> Resources folder (remember to make the shell script executable). Then your AppleScript can find your shell script at runtime and execute it like this:
set ssPath to quoted form of POSIX path of (path to resource "myShellScript.sh")
set stdout to do shell script ssPath
Steve

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Which .bash does "do shell script" commands use?

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