Terrarium定时USB插座控制脚本求助：定时逻辑无法正常运行

Hey there! Let's break down why your current logic isn't working, and how to get your terrarium light schedule running as intended.

The Core Issue #

Your current condition [ $hour -ge $light_on ] && [ $hour -lt $light_off ] tries to check if the hour falls between 22 and 13—but since this is a cross-midnight time range, this condition will never be true (22 is always larger than 13). Instead, you need to split this into two valid, non-overlapping time windows that cover your desired schedule:

• From 22:00 to 23:59 (same day)
• From 00:00 to 12:59 (next day)

Corrected Script Logic #

Here's the fixed code with proper logic for your 22-on / 13-off schedule:

# Define your schedule (24-hour format)
light_on=22
light_off=13

# Get current hour (formatted as 00-23)
hour=$(date +%H)

# Check if we're in the "light on" window (22:00 to next day 13:00)
if [ $hour -ge $light_on ] || [ $hour -lt $light_off ]; then
    # Command to turn the light ON
    echo "Turning terrarium light ON"
    # Replace with your actual USB socket control command, e.g.:
    # ./usb-socket-controller --activate
else
    # Command to turn the light OFF
    echo "Turning terrarium light OFF"
    # Replace with your actual USB socket control command, e.g.:
    # ./usb-socket-controller --deactivate
fi

Extra Tips to Ensure Reliability #

• Automate with Cron: To make this script run automatically, add it to your system's crontab so it checks the time regularly. Run crontab -e and add this line (replace the path with your script's actual location):

  * * * * * /home/your-user/scripts/terrarium-light.sh >> /var/log/terrarium-light.log 2>&1
  

  This executes the script every minute and logs output for debugging.
• Verify Timezone: Double-check your system's timezone with date—if the system time doesn't match your local time, the schedule will be off.
• Test the Commands: Make sure your USB socket control commands work on their own before adding them to the script.

内容的提问来源于stack exchange，提问作者Amar