Shell script is set to start at boot

1. Copy the disable_smt.sh script to the /etc/init.d/ directory

cat disable_smt.sh

#!/bin/bash
# 关闭cpu超线程

echo off > /sys/devices/system/cpu/smt/control

cp disable_smt.sh /etc/init.d/

chmod +x /etc/init.d/disable_smt.sh

2. Use the update-rc.d command to add the script to the startup sequence.

update-rc.d disable_smt.sh defaults

3. Remove the startup configuration and stop the script from running on startup

update-rc.d -f disable_smt.sh remove

4. View the service list

# service --status-all | grep disable_smt.sh
 [ - ]  disable_smt.sh

• [+] – The service with this flag is currently running.
• [–] – The service with this flag is not currently running.

5. Check service status

service disable_smt.sh status
service disable_smt.sh start

reference

1. Ubuntu18 automatically executes at boot – script or command (based on update-rc.d)