/etc/rc4.d/README is in sysv-rc 2.88dsf-41ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | The scripts in this directory are executed each time the system enters
this runlevel.
The scripts are all symbolic links whose targets are located in
/etc/init.d/ .
To disable a service in this runlevel, rename its script in this
directory so that the new name begins with a 'K' and a two-digit
number, and run 'update-rc.d script defaults' to reorder the scripts
according to dependencies. A warning about the current runlevels
being enabled not matching the LSB header in the init.d script will be
printed. To re-enable the service, rename the script back to its
original name beginning with 'S' and run update-rc.d again.
For a more information see /etc/init.d/README.
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