How To List All Of GRUB's "menuentries" From The Command Line?

Introduction

GRUB's menuentries are basically operating systems that are configured in your bootloader to be loaded. 

Procedure

You can list these operating system(s) with the following command: 

FILE=`find /etc/ /boot/ -type f -name "grub.cfg"`; awk -F\' '/^menuentry / {print $2}' $FILE|cat -n|awk '{print $1-1,$1="",$0}'

The result would look like this: 

 FILE=`find /etc/ /boot/ -type f -name "grub.cfg"`; awk -F\' '/^menuentry / {print $2}' $FILE|cat -n|awk '{print $1-1,$1="",$0}'

0 CloudLinux 7.9 Rescue (3.10.0-962.3.2.lve1.5.42.el7.x86_64)
1 CentOS Linux (3.10.0-1127.19.1.el7.x86_64) 7 (Core)
2 CentOS Linux (3.10.0-957.1.3.el7.x86_64) 7 (Core)
3 CentOS Linux 7 (Core)