Create systemd service to remap caps lock to ctrl on boot

caps-to-ctrl.md

1. Create the following three files:

/etc/systemd/system/caps-to-ctrl.service

[Service]
ExecStart=/usr/local/bin/caps-to-ctrl.sh

[Install]
WantedBy=default.target

/usr/local/bin/caps-to-ctrl.sh

#!/bin/bash
setxkbmap -option caps:ctrl_modifier

/lib/systemd/system-sleep/caps-to-ctrl

#!/bin/bash

case "$1" in 
    post)
        setxkbmap -option caps:ctrl_modifier;;
esac

2. Set appropriate permissions and install service

chmod 744 /usr/local/bin/caps-to-ctrl.sh
chmod 664 /etc/systemd/system/caps-to-ctrl.service
chmod 755 /usr/lib/systemd/system-sleep/caps-to-ctrl
systemctl daemon-reload
systemctl enable caps-to-ctrl.service