Startup scripts using "/etc/rc.local"

How to use /etc/rc.local at boot The file name rc refers to Run Control. To start, create the file /etc/rc.local using the editor you want and paste these values:

#!/bin/sh -e
#
# 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.
/bin/bash /somedirectory/test.sh &
exit 0

Then give execution to rc.local

chmod +x /etc/rc.local

Then create the file /etc/systemd/system/rc-local.service and paste these lines:

[Unit]
Description=/etc/rc.local
ConditionPathExists=/etc/rc.local

[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
StandardOutput=tty
RemainAfterExit=yes
SysVStartPriority=99

[Install]
WantedBy=multi-user.target
EOF

After that we need to enable rc-local:

systemctl enable rc-local
systemctl start rc-local