OSX Launchd

<?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>org.dongsheng.crontask1</string>
    <key>ProgramArguments</key>
    <array>
        <string>/usr/bin/app</string>
        <string>-f</string>
        <string>/etc/app.ini</string>
    </array>
    <key>StartInterval</key>
    <integer>3600</integer><!-- seconds -->
</dict>
</plist>

<!-- StartCalendarInterval examples -->
 
    <!-- Run every Sunday (weekday 0) at 15:30/3:30PM -->
    <key>StartCalendarInterval</key>
    <dict>
          <key>Weekday</key>
          <integer>0</integer>
          <key>Hour</key>
          <integer>15</integer>
          <key>Minute</key>
          <integer>30</integer>
    </dict>
 
    <!-- You can use an array of dicts to specify multiple intervals -->
    <!-- Run at the beginning and middle of every hour, every day -->
    <key>StartCalendarInterval</key>
    <array>
        <dict>
            <key>Minute</key>
            <integer>0</integer>
        </dict>
        <dict>
            <key>Minute</key>
            <integer>30</integer>
        </dict>
    </array>