Danke dir, läuft nur leider nicht.
An den Befehlen an sich liegt es nicht, wenn ich die in der Shell manuell eingebe dann startet der cgminer in der screen Session.
Meine rc.local:
#!/bin/sh
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
sleep 180
screen -d -m -S cgminer1 ./cgminer-3.10.0-x86_64-built/cgminer
sleep 180
screen -d -m -S cgminer1 ./cgminer-3.10.0-x86_64-built/cgminer
sleep 180
screen -d -m -S cgminer1 ./cgminer-3.10.0-x86_64-built/cgminer
exit 0