How To Print Non-Blank and Uncommented Lines in Linux

Overview

The purpose of this document is guide display the contents of the file without blank lines and un-commented lines of a file on Linux Operating flavours.

Applies To

Tested on RHEL 7, CentOS 7.

Pre-Requisites

·        None

Print Non-Blank Lines

In order to display the contents of the file without blank lines run the command below;

cat /etc/sudoers | grep -v '^$' | head

Note: Commented lines will be printed.

Print Un-commented Lines

In order to display the contents of the file suppressing commented lines run the command below;

cat /etc/sudoers | grep -v '^ *#'

Note: Blank lines will be printed.

Print Non-Blank and Un-commented Lines

In order to display the contents of the file without blank and suppressing commented lines only run the command below;

cat /etc/sudoers | grep -E -v '^$|^ *#'

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