What is "uswsusp"

uswsusp, abbreviated from userspace software suspend and stylized as µswsusp, is a set of userspace command-line utilities for Linux that act primarily as wrappers around the Linux kernel hibernation functionality and implement sleep mode ( utility, referred to as "suspend to RAM"), hibernation ( utility, referred to as "suspend to disk"), and hybrid sleep ( utility, referred to as "suspend to both"). It supports Linux kernel versions 2.6.17 and newer.

uswsusp supports image checksumming, data compression, disk encryption, and integration with Splashy and fbsplash.