A.install

B.update

C.auto-update

D.dist-upgrade

E.full-upgrade

A.The command does not need to execute immediately.

B.The command has to run immediately but the user needs to log out.

C.The command can run at a lower priority than normal commands run on the command line.

D.The system is being shut down and the command needs to restart execution immediately after the reboot.

A.apt-get search /etc/debian_version

B.apt -r /etc/debian_version

C.dpkg -S /etc/debian_version

D.find /etc/debian_version -dpkg

E.apt-file /etc/debian_version

A.d2

B.2d

C.2dd

D.dd2

E.de12

A.bash_history

B.history

C.bashrc_history

D.bash_histfile

E.history_bash