Shell Scripting - How will you list only the empty lines in a file (using grep)?

GeekInterview.com > Interview Questions > Operating System > Shell Scripting

Go To First | Previous Question | Next Question

Shell Scripting | Question 11 of 47

How will you list only the empty lines in a file (using grep)?

Total Answers and Comments: 6

Last Update: June 05, 2009

Sponsored Links

Best Rated Answer

—

No best answer available. Please pick the good answer available or submit your answer.

June 03, 2005 06:23:10

dkbaba

RE: How will you list only the empty lines in a file (using grep)?

grep ^$ filename.txt

Is this answer useful? Yes | No

0 1

Overall Rating: -1

July 09, 2005 07:35:27

giri

RE: How will you list only the empty lines in a file (using grep)?

grep -c ^$ filename.txt

Is this answer useful? Yes | No

0 1

Overall Rating: -1

February 15, 2006 06:59:22

Pallavii Potdaar

RE: How will you list only the empty lines in a file ...

grep ^[ ]*$ filename.txt

In character set (between [ and ] one space and tab is given)

this command will gives all the blank line including those having space and tabs (if pressed)only

Is this answer useful? Yes | No

0 1

Overall Rating: -1

June 04, 2008 18:58:32

Vivek12

Member Since: June 2008 Contribution: 3

RE: How will you list only the empty lines in a file (using grep)?

We can do this efficiently through awk script

awk '{
if (NF 0)
{
print "Here comes the empty line"
print $0
}
}' filename

NF number of fields in the current line
$0 current line

Is this answer useful? Yes | No

March 19, 2009 20:57:58

gcvpgeek

Member Since: March 2009 Contribution: 9

RE: How will you list only the empty lines in a file (using grep)?

use the below command to fetch the blank lines

grep -v . filename

Is this answer useful? Yes | No

June 05, 2009 05:25:22

Rohit_Ash

Member Since: May 2009 Contribution: 6

RE: How will you list only the empty lines in a file (using grep)?

Both of these work.

cat test.sh | grep ^$

grep -v . test.sh

Is this answer useful? Yes | No

Go To Top

User Name		Remember Me?
Password

Question Bank