Remove blank line using Grep and sed

scmuser created the topic: Remove blank line using Grep and sed
Hi,

How do you remove blank line using grep and sed in shell scripting?

rajeshkumar replied the topic: Re: Remove blank line using Grep and sed

grep -v "^$" filename > newfilename

The ^$ within the quotes is a regular expression: ^=beginning of line, $=end of line, with no characters between.

To store output to another file use redirection operator:

$ sed ‘/^$/d’ /tmp/data.txt > /tmp/output.txt

Regards,
Rajesh Kumar
Twitt me @ twitter.com/RajeshKumarIn

rajeshkumar replied the topic: Re: Remove blank line using Grep and sed
The above script will work only if you have no character in the blank line but most of the time it can happen that Tab can be possle in blank line….

so for this situation u should try following..

sed '/^[PRESS TAB]*$/d' filename

Regards,
Rajesh Kumar
Twitt me @ twitter.com/RajeshKumarIn

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.