Implemented Shell commands in Linux for generating live weather forecasts. Enabled user input of zip codes to fetch real-time data and display current conditions. Provided concise forecast summaries for enhanced user experience.

NOTE. For more information on how the program works, read the provided text and code below:

Info

How does it work?

  1. The program is executed in linux and displays the weather information. Inputting flags as arguments, the user can change between farenheit and celcius. Additionally, they can include a zipcode, otherwise it defaults to South Bend, IN.

  2. I created an alias and implemented the shell script so that it displays the weather forecast information for South Bend, every time I login into my Linux Terminal.

COMMAND LINE OUTPUT. The following is a sample of what the ouput in command line looks like:

./weather.sh -f
Temperature: 55 degrees
Forecast:    Fair

SOURCE CODE. The following is a file written in shell script:

#!/bin/sh

# Globals

URL="https://forecast.weather.gov/zipcity.php"
ZIPCODE=46556
FORECAST=0
CELSIUS=0

# Functions

usage() {
    cat 1>&2 <<EOF
Usage: $(basename $0) [zipcode]

-c    Use Celsius degrees instead of Fahrenheit for temperature
-f    Display forecast text after the temperature

If zipcode is not provided, then it defaults to $ZIPCODE.
EOF
    exit $1
}

weather_information() {
    # Fetch weather information from URL based on ZIPCODEi
	curl -sL https://forecast.weather.gov/zipcity.php?inputstring=$ZIPCODE
}

temperature() {
    # Extract temperature information from weather source
	if [ "$CELSIUS" -eq 1 ]; then
   		weather_information | grep "myforecast-current-s" | cut -d '>' -f2 | grep -Eo '[0-9]+'
	else 
		weather_information | grep "myforecast-current-l" | cut -d '>' -f2 | grep -Eo '[0-9]+'
	fi
}

forecast() {
    # Extract forecast information from weather source
    weather_information | grep "myforecast-current[^-]" | cut -d '>' -f2 | cut -d '<' -f1 | sed 's/^[ \t]*//;s/[ \t]*$//'
}

# Parse Command Line Options

while [ $# -gt 0 ]; do
    case $1 in
	-h) usage 0;;
	-c) CELSIUS=1;;
	-f) FORECAST=1;;
	*) ZIPCODE=$1;;
    esac
    shift
done

# Display Information

echo "Temperature: $(temperature) degrees"

if [ "$FORECAST" -eq 1 ]; then
	echo "Forecast:    $(forecast)"
fi