I have a master shell script in csh to do some tasks where some output files will be created under a sub-directory. That shell script will also rsh to another host machine to run other shell scripts.

Since I want to allow a common user 'A' to execute my shell scripts in order to get the output files, my shell scripts will make a copy of the output files into a sub-directory under user 'A' home directory (user 'A' has set the folder permission to allow me to do so).

I set the file permission of my master shell script to be "-wrx-rx-rx" to allow user 'A' to run my master shell script so as to get the output files. However, when user 'A" executes my master shell script, some interactive prompt for confirmation appear, e.g. removing files or overwriting files, during the execution time. (no any interactive prompt if I run the shell script with my username)

I checked that user 'A' has set the alias rm as 'rm -i' and cp as 'cp -i'.

My questions:-
1) When user A executes my shell script, is the script executed under my own user environment or user A environment?
2) How can I allow user 'A' to only execute my shell script without privilege to read (hence not able to copy out)?
3) Any other better means to achieve my purposes?

Anyone can help. Thanks.

1) it will be run under your environment use the "su -" with the username of the user whose environment you want to take on.

2) no, you need read privileges to be able to execute a file

3) well there are many ways to skin a cat depending on what you want to do. You say that the user is getting prompted it they want to remove files, well yes that's what the -i flag does. You can override this with -f (rm -f)to force the deletion of any file. This, of course, has its perils hence why the default on most distros these days is rm -i

For 1), does it need password for "su -" to switch to my account

Foe 3), I already use "rm -f" for file deletion in all my shell scripts. From manual page, it seems that "rm -i" override "rm -f" indeed. If this is true, I may unalias the rm first before "calling" my shell script. Any ideas?

no need to 'unalias' - just do "\rm -f" - this will skip the 'aliasing'