Shell and Process Invocation

Question 1

What does shell interaction involve?

Answer 1

Starting, controlling, and ending sessions.

Question 2

Which commands help manage process invocation and shell behavior?

Answer 2

Ctrl+D and exec.

Question 3

What does Ctrl+D do?

Answer 3

Signals end of input and closes the session.

Question 4

What does exec do?

Answer 4

Replaces the current process with another.

Question 5

What signal does Ctrl+D send?

Answer 5

End-of-file (EOF) signal to the shell.

Question 6

What happens when Ctrl+D is pressed?

Answer 6

Closes the current shell session gracefully.

Question 7

Does Ctrl+D require typing a command?

Answer 7

No, it does not.

Question 8

Example of Ctrl+D usage?

Answer 8

Pressing Ctrl+D after finishing tasks logs out and returns to login prompt.

Question 9

What does exec command do?

Answer 9

Replaces current shell or process with a new one.

Question 10

Syntax for exec command?

Answer 10

exec [command] [arguments].

Question 11

Does exec return to original shell after execution?

Answer 11

No, it does not.

Question 12

Example of exec usage for SSH?

Answer 12

exec ssh admin@server02 replaces current session with SSH login.

Question 13

Example of exec usage for output redirection?

Answer 13

exec > session.log 2>&1 redirects output and errors to session.log.

Question 14

What does ‘exec > session.log 2>&1’ do?

Answer 14

Redirects standard output and error to session.log.

Question 15

What happens after exec redirection?

Answer 15

Future commands write output and errors to session.log.

Question 16

Will the screen display outputs after exec redirection?

Answer 16

No, outputs will no longer display on screen.

Question 17

Why use exec for SSH?

Answer 17

To replace the shell with a remote session without returning.

Question 18

Why use exec for redirection?

Answer 18

To capture all outputs and errors in a file for logging.

Question 19

What is the overall benefit of exec?

Answer 19

Efficiently replace processes and manage session behavior.

Question 20

What is the overall benefit of Ctrl+D?

Answer 20

Gracefully end shell sessions without extra commands.