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Originally Posted by
Beginner123
Because our departments get the space for Free .
You are free to decide whatever you want, but be warned: this is a very, very, bad reason to base a decision on in all things technical.
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Could any one please suggest, how to make the (/xshare) file system an write once ,while owner group users of this share can read the contents. If I could solve that I can close this request.
There is definitely, positively no such thing: either one is allowed to write or not. If one is allowed to write he is permanently entitled to do so, if one is forbidden the non-entitlement is also permanent.
You could write a script which checks the directory in question and, if files are in it, mounts it read-only, otherwise it mounts read-write. Then put a cron job in place so that the directory gets unmounted/remounted once a day (or more often, whatever you deem feasible).
This will be as close as possible to "write once", but you will have to understand that your original requirement is not possible as such, any solution will be a better or worse compromise between what you want and what is possible.
I hope this helps.
bakunin