AWK Formatting Output

Question 1

Common escape sequences for echo -e or printf:
\b

Answer 1

Backspace

Question 2

Common escape sequences for echo -e or printf:
\f

Answer 2

Form feed

Question 3

Common escape sequences for echo -e or printf:
\n

Answer 3

Newline (line feed)

Question 4

Common escape sequences for echo -e or printf:
\r

Answer 4

carriage return

Question 5

Common escape sequences for echo -e or printf:
\t

Answer 5

horizontal tab

Question 6

Common escape sequences for echo -e or printf:
\v

Answer 6

vertical tab

Question 7

awk ‘BEGIN{printf “|%10s|\n”, “hello”}’

Answer 7

Right align
| hello|

Question 8

awk ‘BEGIN{printf “|%-10s|\n”, “hello”}’

Answer 8

Left align
|hello |

Question 9

Common AWK specifiers:
c

Answer 9

ASCII Character

Question 10

Common AWK specifiers:
d

Answer 10

Decimal integer

Question 11

Common AWK specifiers:
e, E, F

Answer 11

FLoating-point format

Question 12

Common AWK specifiers:
o

Answer 12

Unsigned octal value

Question 13

Common AWK specifiers:
s

Answer 13

String

Question 14

Common AWK specifiers:
%

Answer 14

Literal %

Question 15

Break down how this ss output is parsed with AWK:
ss -lunt | awk ‘NR>1{i=split($5,a,”:”);print a[i]}’

Answer 15

ss -lunt
Lists TCP ports that are listening
and Lists UDP ports that are open

NR>1
skip the first line

i=split($5,a,”:”)
split our input in field 5 (delimiter is colon)

print a[i]
print the last field from each split operation