How to check argument count?

You can check the number of arguments passed to a shell script using the special variable $#, which represents the total number of arguments. Here’s an example:

#!/bin/bash

# Check the number of arguments
if [ $# -lt 2 ]; then
    echo "Error: At least two arguments are required."
    echo "Usage: $0 <arg1> <arg2> ..."
    exit 1
fi

echo "Total number of arguments: $#"

In this script, if fewer than two arguments are provided, it will display an error message and usage instructions. To run this script, save it to a file (e.g., check_args.sh), make it executable with chmod +x check_args.sh, and execute it with different numbers of arguments:

./check_args.sh arg1 arg2

This will output:

Total number of arguments: 2

If you run it with fewer than two arguments, it will show the error message.