replacing blank lines

bharatbsharma · 10-25-2007, 03:26 AM

Generally ppl talk about deleting blank lines frm a file but i want replace 'single blank line ' by 'double or more blank line'

ehawk · 10-25-2007, 03:48 AM

Here is a suggestion using perl:

http://www.unix.com/unix-advanced-ex...ines-file.html

AnanthaP · 10-25-2007, 06:17 AM

Are you sure this too shouldn't be done using awk? What did your teacher specify?

The pseudo code in awk may go like this.

For each line.
-- If the length is 0, then write the line and one more new line.
-- Else Write the line.]

End

ghostdog74 · 10-25-2007, 07:13 AM

Code:

awk '/^$/{print "\n\n";next}1' "file"

or

Code:

awk '/^$/{print;print;print;next}1' "file"

jschiwal · 10-25-2007, 07:24 AM

This will add another blank line using sed:
sed -i '/^$/i\
> ' test

radoulov · 10-25-2007, 08:44 AM

Code:

awk 'ORS=NF?"\n":"\n\n"' filename

Add more \n after the semicolon if you wish.