Write a program that is passed a file name and a string to be searched through command-line arguments code example

Example 1: check command line input is a number in c

bool isNumber(char number[])
{
    int i = 0;

    //checking for negative numbers
    if (number[0] == '-')
        i = 1;
    for (; number[i] != 0; i++)
    {
        //if (number[i] > '9' || number[i] < '0')
        if (!isdigit(number[i]))
            return false;
    }
    return true;
}

Example 2: get input from command line and run command in c++

> args my_file.txt
Line fab
Line fab
Line edc