20250415

Question 1

To invoke several commands on a single commandline, no matter which one fails or succeeds:

Answer 1

We use semicolons ;

Question 2

To run a sequence of commands, but stop execution if any of them fails

Answer 2

Seperate them with &&

Question 3

To run a sequence of commands, stopping execution as soon as one succeeds

Answer 3

Separate them with ||

Question 4

What does pipe | operator do?

Question 5

What does the sort command do in Linux?

Answer 5

It arranges lines in a file or input in order, like alphabetical or numerical order.

Question 6

How do you sort lines in a file alphabetically?

Answer 6

Use sort filename.txt

Question 7

How do you sort numbers correctly (not alphabetically)?

Answer 7

Use sort -n filename.txt

Question 8

How do you sort in reverse order?

Answer 8

Use sort -r filename.txt

Question 9

How do you remove duplicates while sorting?

Answer 9

Use sort -u filename.txt

Question 10

How to tell the shell to remove the command and substitute the commands’s output?

Answer 10

surrund it with backticks or $(<command>)

echo this year is $(date +%Y)