Unix Questions and Answers – sed command – 2

This set of Unix Multiple Choice Questions & Answers (MCQs) focuses on “sed command – 2”.

1. sed can also perform the substitution.
a) True
b) False
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2. Which one of the following is the correct syntax for performing substitution using sed?
a) sed [address]s /expr1/ expr2
b) sed [address]s /expr1 expr2
c) sed [address]s /expr1/ expr2/ flags
d) sed [address]s
View Answer

sed [address]s  /expr1/ expr2/ flags

3. Which one of the following command is used for replacing | with : globally?
a) sed ‘s/|/:/’ emp.lst
b) sed ‘/|/:/’ emp.lst
c) sed ‘s/|/:/g’ emp.lst
d) sed ‘s/
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4. To replace the string ‘director’ in the first five lines of file emp.lst with ‘manager’ we can use _____
a) sed ‘s/director/manager/’ emp.lst
b) sed ‘1-5s/director/manager/’ emp.lst
c) sed ‘1,5s/director/manager/’ emp.lst
d) sed ‘15s
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5. Which of the following characters are used with sed as anchoring characters?
a) $
b) ^
c) %
d) $ and ^
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$ sed ‘s/^/2/’  emp.lst          //add first character with a prefix ‘2’
$ sed ‘s/$/.00/’ emp.lst        // add the last character with a suffix ‘.00’

6. What will be the function of the following command?
$ sed ‘s/ *|/|/g’ emp.lst
a) replace * with |
b) replace / with |
c) compress multiple spaces
d) erroneous output
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7. Basic regular expressions are divided into ______ categories.
a) 1
b) 3
c) 2
d) 5
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8. The interval regular expression uses the character _______
a) {
b) }
c) { and }
d) ( and )
View Answer

$ grep  ‘[0-9]\{10\}’  emp.lst

9. Which one of the following command will be used for adding two spaces before every line in emp.lst?
a) sed ‘s/^/ /’ emp.lst
b) sed ‘s / / /’emp.lst
c) sed ‘s /$/ /’emp.lst
d) sed ‘s/$/
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10. Which shortcut does sed offer to replace the string Linux with Red hat Linux?
a) { }
b) ( )
c) ^^
d) &
View Answer

$ sed ‘s/ Linux/Red Hat &/’ emp.lst

11. Which command will be used for selecting lines 3 to 10 from emp.lst?
a) sed 3,10 emp.lst
b) sed -n ‘3,10p’ emp.lst
c) sed -n ‘^,10p’ emp.lst
d) sed -n, 10p
View Answer

  $ sed -n ‘1,$p’ emp.lst

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