Enter Single user mode in Linux / RHEL / CENTOS / Fedora

If you are using GRUB bootloader

• Select the particular kernel to boot in (use up and down arrows in the GRUB splash screen)
• Now you will find an option "press a to append..". So press the key "a".
• Now press the space key to add at the bottom of that line.
• Append the word the "s" or "single" to the end of the kernel line.
• Press Enter

Now you are booting into the rescue mode..

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