Learn AWK with Real Code Examples

BEGIN {
    count = 0;
    isDark = 0;

    function updateUI() {
        print "Counter: " count;
        if (isDark) print "Theme: Dark";
        else print "Theme: Light";
    }

    function increment() {
        count += 1;
        updateUI();
    }

    function decrement() {
        count -= 1;
        updateUI();
    }

    function reset() {
        count = 0;
        updateUI();
    }

    function toggleTheme() {
        isDark = !isDark;
        updateUI();
    }

    # Simulate actions
    updateUI();
    increment();
    increment();
    toggleTheme();
    decrement();
    reset();
}

Demonstrates a simple counter with theme toggling using AWK variables and functions.

BEGIN {
    sum = 0;
    for (i=1; i<=5; i++) sum += i;
    print "Sum:", sum;
}

Calculates sum of numbers from 1 to 5.

BEGIN {
    fact = 1;
    for(i=1;i<=5;i++) fact *= i;
    print "Factorial: ", fact;
}

Calculates factorial of 5 using a loop.

BEGIN {
    a=0; b=1;
    print a;
    print b;
    for(i=3;i<=10;i++) {
        sum=a+b;
        print sum;
        a=b;
        b=sum;
    }
}

Prints first 10 Fibonacci numbers.

BEGIN {
    n=13;
    isPrime=1;
    for(i=2;i<=sqrt(n);i++) if(n%i==0) isPrime=0;
    print "Is prime:", isPrime;
}

Checks if a number is prime.

BEGIN {
    str="HELLO";
    rev="";
    for(i=length(str);i>0;i--) rev=rev substr(str,i,1);
    print rev;
}

Reverses a string.

BEGIN {
    n=5;
    for(i=1;i<=10;i++) print n,"x",i,"=",n*i;
}

Generates multiplication table of 5.

BEGIN {
    c=25;
    f=c*9/5+32;
    print "Fahrenheit:", f;
}

Converts Celsius to Fahrenheit.

BEGIN {
    temp=80; thresh=75;
    if(temp>thresh) print "Alarm: Temp Too High!";
    else print "Temp Normal";
}

Prints an alarm if temperature exceeds threshold.

BEGIN {
    pos=0;
    for(i=1;i<=10;i++) {
        pos += (rand()<0.5?-1:1);
        print pos;
    }
}

Simulates a 1D random walk for 10 steps.