Bash script run by root or not

How do I check bash script is being run as a root user or not. when creating a new account a user ID is assigned to each user. Bash shell store value user ID is $UID and $EUID variable. Bash script the essential for DevOps Roles.

Example, To check bash script run by root or not.

Using $UID variable

#!/bin/bash
if [ "$(id -u)" != "0" ]; then
   echo "Please run by root user" 2>&1
   exit 1
else
   echo "Mounting...."
   mount /dev/sdb4 /mnt/disk4
fi

Using $EUID variable

#!/bin/bash
if [[ $EUID -ne 0 ]]; then
   echo "Please run by root user" 2>&1
   exit 1
else
   echo "Mounting...."
   mount /dev/sdb4 /mnt/disk4
fi

Conclusion

Thought the article, you can use Bash script run by root or not as above. I hope will this your helpful. More details refer to Bash script.