20250421

Question 1

What is a job on Linux?

Answer 1

A job is simply the shell’s unit of work. The jobs are at a higher level than Linux processes - the Linux OS knows nothing about them. They are merely constructs of the shell

Question 2

How to ask a command to run in the background?

Answer 2

Place & after the command.

Question 3

How to suspend the current foreground job?

Answer 3

^z
- It simply stops running, but its state is remembered.

Question 4

How to unsuspend a jobs or bring it to the foreground?

Answer 4

fg %1

Question 5

What does bg %2 do?

Answer 5

Make a suspended job (job No.2) run in the background
- with no argument, bg operates on the most recently suspended job.

Question 6

What does yes command do?

Answer 6

Continiously prints y untill you kill it.

Question 7

What is dev/null?

Answer 7

dev/null is a special file in Unix/Linux systems - often called the bit bucket or black hole - It is a special device file that discards anything written to it. If a program writes output to /dev/null, it's effectively silenced. - If you try to read from it, it gives you no data. - It ignores standard output or standard error’ of the command.

Question 8

How to terminate a shell?

Answer 8

Type exit or press ^D

Question 9

What is .bashrc?

Answer 9

Commands in .bashrc run every time you launch an interactive shell

Question 10

What is .bash_logout

Answer 10

Commands in it run each time you log out.

Question 11

If the output of a command is longer than screen, how to use less?

Answer 11

man wc | less