Switching user inside a shell script doesn't seem to work


 
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Old 03-24-2014
In this first code sample that u gave, all the $ symbol were given without escaping them. So what the shell was doing was expanding the variables first and then pass it to the su command. This variables being undefined in the shell in which you invoked them were expanded as blank and then passed to the su. So when you try to print them into a file using echo the actual variables that were getting printed was the one in the main shell and the not the one that was intended,i.e, the One which are in su.
That being said what I did was escape all the characters that might be expanded in the main shell and then pass it to su so that unwantef shell substitution/expansion do not take place.

That also being said the best approach to your issue would be to create another script which does all the things that the other user does and then call that script while you do su. That way you can avoid all these confusion.
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NPM-RUN-SCRIPT(1)                                                                                                                NPM-RUN-SCRIPT(1)

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npm run-script <command> [--silent] [-- <args>...] alias: npm run DESCRIPTION
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