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I need to write a script which has to list all the files which are created before six months from now.

kindly help on this ...

UNIX does not have a created date. What you want is the last time the file was modified - that date. Using 180 days for six months (you can adjust the number)

lists all of the files older than six months.
gives a long directory listing... so you can verify dates.

How can I delete these files once i get from this find command.

kindly assist please.. this is an urgent issue

for any 'urgent' issue try to understand a given hint, browsE the relative 'man' pages' for further help and come back with specific questions.

You can remove file in a similar way mcnamara suggested.

find /path/to/directory -mtime +180 -exec rm {} \;

remember here it is necessary to give semicolon and has to be preceded by \ to take away its special meaning.here {} indicate that searched files would become arguments for rm.

Use ctime instead of atime. I'm also assuming that you meant "created more than six months ago," because everything was created before six months from now."

find . -ctime +180