Welcome to LQ!!!
Putting the title as Urgent will not help you to any assistance or help quickly. We are a community not a support. I would suggest you to have a look at LQ rules here
Coming to your query:
which are the commands used for disaster recover?
a)SCp b)Cpio c)DUMP d) Restore
Which character is used to match excatly one character?
a)* b)/ c)^ d)? e) None
It appears like a homework or question from some exam. You could have easily find out the answer to your question by doing a simple search on the web. We really appreciate when a member has done his homework and then post a query.
Anyways, answer to your queries is as follows:
a. restore :- check out the manpage of restore and you will get the idea. To be honest I wouldn't consider it as full fledge disaster recovery it is more of what the name suggest restore.
b. * : you might want to have a look at wildcards: http://tldp.org/LDP/GNU-Linux-Tools-...tml/x11655.htm