Run and make daemon

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Assume you have a binary or jar in some directory and you want to run it as daemon (which will not be killed as long as the os is runing)

use systemd/systemctl on Linux

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[Unit]
Description=Tests systemd to daemonize a Go binary
Document=
Wants=network.target
After=network.target

[Service]
Type=simple
DynamicUser=yes
ExecStart= your command (./some/dir/binary -args) or (java -cp classes -args)
WorkingDirectory= your desired working directory
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target

Store the above as /usr/lib/systemd/system/foo.service

Start the service with:

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$ sudo systemctl start foo.service

And enable it during startup with:
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$ sudo systemctl enable foo.service

You can check the status of the service with:
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$ systemctl status foo.service

On mac system

use launchd/launchctl on MacOS

Launchd uses xml for configuration

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.username.test</string>

  <key>ProgramArguments</key>
  <array>
    <string>/path/to/script.sh</string>
  </array>

  <key>Nice</key>
  <integer>1</integer>

  <key>StartCalendarInterval</key>
  <dict>
    <key>Hour</key>
    <integer>17</integer>
    <key>Minute</key>
    <integer>55</integer>
  </dict>

  <key>RunAtLoad</key>
  <true/>

  <key>EnvironmentVariables</key>
    <dict>
      <key>PATH</key>
      <string><![CDATA[/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin]]></string>
    </dict>
    <!-- for the use of node and brew packages -->

  <key>StandardErrorPath</key>
  <string>/tmp/Test.err</string>

  <key>StandardOutPath</key>
  <string>/tmp/Test.out</string>
</dict>
</plist>

to run the daemon as root user
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cp com.username.plist /Library/LaunchDaemon/
launchctl load com.username.plist

to run only when you login
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cp com.username.plist ~/Library/LaunchAgents/
launchctl load com.username.plist