Remove all blank lines in shell or awk.

Shell Programming and Scripting
1

Hi there,

I want to trim space between lines in unix.
I have a file named abc.txt with 2,00,000 lines.But useful are only a few. Please tell me how to delete the blank lines.:o

2

Take your pick:

tr -s '\n' < abc.txt

grep -v "^$" abc.txt

sed '/^$/d' abc.txt

sed '/./!d' abc.txt

awk '/./' abc.txt