echo

The echo Command

Every Linux system has an echo command. It prints its argument to stdout followed by a newline. Here is how it works:

$ echo "hello"
hello

Simple — but it is a real compiled C program, part of the GNU coreutils package. Your task in this course is to reimplement each of these tools from scratch in C.

Your Implementation

Write a function void my_echo(const char *s) that prints the string s followed by a newline character.

void my_echo(const char *s) {
    printf("%s\n", s);
}

printf with %s\n is all you need. The real echo handles flags like -n (no newline) and -e (escape sequences), but start with the core behavior.

Why Rewrite Coreutils?

The tools you used in the Linux course — cat, grep, wc, head, tail — are all C programs. They are small (a few hundred lines each), focused, and brilliant. Reimplementing them teaches you:

• How to process strings with pointer arithmetic
• How to build state machines for text parsing
• How C programs actually work under the hood
• Why the Unix philosophy ("do one thing well") produces great software

Your Task

Implement my_echo so it prints the string followed by a newline.