A.procfs

B.JFS

C.XFS

D.ext2

E.ext3

A.It must be sent by any SSH client in addition to a user key in order to identify the client's host.

B.It provides the server's identity information to connecting SSH clients.

C.It is the root key by which all user SSH keys must be signed.

D.It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts.

E.It authenticates any user that logs into a remote machine from the key's host.

A.chmod 4775 /tmp

B.chmod 2775 /tmp

C.chmod +s /tmp

D.chmod +t /tmp

E.chmod 1775 /tmp

A.No action is required

B.grub-install

C.grub

D.kill -HUP $(pidof grub)

A.tar cf archive.tgz

B.gzip -d archive.tgz | tar tvf -

C.gzip archive.tgz | tar xvf -

D.tar ztf archive.tgz