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Using above command , I delete all the files belong to group abc.
Now the problem i face is that the this command gives error that some files are missing . And this error occur because after creating list of files, it pass that list to rm -rf but till that time sendmail process queue and some of files disapper from /var/spool/mqueue.
Any suggestion to avoid this error message please ..
I had to look it up since I don't use sendmail, Postfix has the postuser command that takes care of things like you want to do. I think the best way to go is to stop the sendmail daemon first, clean up the queue and start the sendmail daemon again.
You are of course entitled to have a different opinion. I only pointed you to the fact that you are using find to delete specific messages from the sendmail queue and that there are alternatives. I even told you that most likely if you stop the sendmail daemon before beginning the cleanup operation you'll not encounter that error. The find command passes the hits one after another to the rm command so it's not surprising that you encounter errors when running that on a mail queue that's active.
If you know how to clean up the sendmail queue then why are you insisting on using find to delete files from it when the daemon is active?