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$ chmod 644 alert_operdb.log
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Why are you doing that? That means file alert_operdb.log is readable to every one, then you don't need to make user rozan a member of oinstall, because rozan can access that file with 644 even if she is not a member of oinstall group.
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i would not like to give her the permission to delete any files
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Parent directory should have 750 permissions.
Regards,
Tayyab
