Question

Given the following command sequence:

echo 'blue orange green brown' | while read a b c d; do echo output: $b $c $a $d; done
Which of the following is the correct output?
A. orange green blue brown
B. blue orange green brown

Answer 1

The correct output of command sequence is option a) orange green blue brown.

Step-by-step explanation:

The command sequence starts by echoing the string 'blue orange green brown'.

The pipe character ('|') is used to redirect the output of the echo command as the input to the while loop.

The while loop reads the input line by line and assigns the space-separated values to variables a, b, c, and d.

In the echo command within the loop, $b represents the value of variable b, $c represents the value of variable c, $a represents the value of variable a, and $d represents the value of variable d.

The output is then printed in the order of b, c, a, and d, resulting in the correct output: orange green blue brown.