I checked manual of find , and there's an option -ctime which specify the last modification time of inode.But on what occasion would inode change ? When is that option useful ?
On what occasion will inode change?
timestamps;inode
To simplify:Any change in file contents changes both the mtime and the ctime.Any change in metadatas (permissions and other information shown by stat) changes only ctime.When is it useful: I don't know But for example, if you want an over-approximation for the time when the last link (ln) to the inode was created, you should check ctime not mtime.