Unix Questions and Answers – Various Operations using Awk Command – 1

This set of Unix Multiple Choice Questions & Answers (MCQs) focuses on “Various Operations using Awk Command – 1”.

1. Which filter apart from perl, is the most powerful?
a) sed
b) awk
c) grep
d) cut
View Answer

2. Awk filter operates at field level.
a) True
b) False
View Answer

3. Which of the following will be used to print lines containing ‘manager’ in emp.lst?
a) awk ‘/manager/ { print }’ emp.lst
b) awk ‘/manager { print }’ emp.lst
c) awk ‘/manager/ { print } emp.lst
d) awk ‘manager { print }’ emp.lst
View Answer

awk  options  ‘selection_criteria { action }’ file(s)

4. The default action if selection_criteria is missing is ____
a) print
b) split
c) print and split
d) no default action
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5. For pattern-matching, awk uses regular expressions in ____ style.
a) sed
b) grep
c) perl
d) print
View Answer

$ awk -F “|” ‘/sa[kx]s*ena/’  emp.lst

6. awk uses ______ for splitting a line into fields.
a) special parameters
b) shell variables
c) env variables
d) command arguments
View Answer

$ awk -F “|” ‘/sales/ { print $2, $4, $6 }’  emp.lst         
 // prints 2nd, 4th and 6th field where pattern is matched

7. Which built-in variable is used by the awk to specify the line numbers?
a) AR
b) NR
c) $$
d) $?
View Answer

$ awk  -F “|” ‘NR == 3, NR == 6 { print NR, $2, $4 }’ emp.lst

8. What is the default delimiter used by awk?
a) tab
b) whitespace
c) double space
d) |
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9. The printf function uses ___ for string data and ___ for numeric.
a) %f, %l
b) %s, %f
c) %s, %d
d) %s, %s
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10. awk doesn’t use $ in evaluation or assignment of variables.
a) True
b) False
View Answer

X=”5”
print X            // prints 5

11. A user-defined variable is initialized to ____
a) zero
b) zero or null string
c) null
d) operator
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12. awk uses ___ operator for concatenating strings.
a) >
b) |
c) *
d) no operator available
View Answer

x=”sanf” ; y=”com”
print x y        // prints sanfcom

13. awk uses __ and __ as comparison operators.
a) $$, ^^
b) ||, &&
c) %%, ##
d) ||, @@
View Answer

$ awk  -F “|” ‘$3== “director” || $3== “manager” { printf “%-20s  %-12s  %d\n”, $2, $6}’ emp.lst

14. awk allows the user to use variables of his own choice.
a) True
b) False
View Answer

$ awk  -F “|” ‘$3== “director” || $6 > 6000 { 
> count=count+1
>printf “%-20s  %d\n”, $2, $6}’ emp.lst

15. Which option is used for reading an awk program from a file?
a) -e
b) -f
c) -i
d) -F
View Answer

$ cat emp1.awk
$3== “director” || $6 > 6000 { 
count=count+1
printf “%-20s  %d\n”, $2, $6}
 
// commands written in emp1.awk are executed on emp.lst
$ awk  -F “|” -f emp1.awk  emp.lst

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