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Ｉthink you can write a shell which use funcs to solve this problem.And this shell can be encapsulate into a executable command .Make sure you change the password file's privilege to root only.But...

Here is one way I figure out ,FYI.
1.Create a crontab job shell,in which you list files in a fixed directory which may .temp.If there is a .sh file in the directory,then just run it.Then U may...

And as a complementarity,there is also usage as
CONFIGURE=${CONFIGURE:+YES}
CONFIGURE=${CONFIGURE:-YES}
CONFIGURE=${CONFIGURE:?YES}
Also,U can replace "YES" with other commands quoted with ``.