How To Boot Into Single User Mode on Oracle Linux 6
You may wish to boot into single user mode on Oracle Linux in order to perform system maintenance, or to attempt to recover or repair a server that is experiencing software errors and won't finish booting into the OS properly.
In Oracle Linux 7 (OL7) or higher, init.d and runlevels (including runlevel 1 or single user mode) have been replaced by systemd and targets. The equivalent to single user mode on OL7 or higher is emergency mode.
To find out how to boot an OL7 or higher server into emergency mode with systemd, check this article.
For Oracle Linux 6, you can boot into single user mode by doing the following:
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