A.ls > data

B.ls >> data

C.ls >& data

D.ls 3> data

A.chown -u dan -g staff file.txt

B.chown dan/staff file.txt

C.chown dan:staff file.txt

D.chown dan -g staff file.txt

A.s/txt$/bak.txt/

B.s/^.txt/.bak/

C.s/[.txt]/.bak$1/

D.s/^txt$/.bak^/

E.s/txt/bak.txt/

A.The backup is guaranteed to be uncharged because a hard linked file cannot be modified after its creation.

B.The backup consumes less space because the hard links point to the same data on disk instead of storing redundant copies.

C.The backup runs faster because, instead of copying the data of each file, hard links only change file system meta data.

D.The backup runs faster because hard links are asynchronous operations, postponing the copy operation to a later point in time.

E.The old backups can be moved to slow backup media, such as tapes, while still serving as hard link target in new backups.

A./opt

B./etc

C./home

D./var

E./lib