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C Cheatsheet

Published on December 23, 2020

This document was migrated from DigiDocs

The example program below prints out all command line arguments passed into the main() function.


#include <stdio.h>

int main(int argc, char **argv) {
for (int i = 0; i < argc; i++) {
printf("%s\n", argv[i]);

Key details:

  • argc - the number of arguments passed into the program
  • argv - the array of character pointers (strings) containing all arguments
  • argv[0] - the first argument which is also the name of the program

To use:

  • Enter the above code into a file (e.g. print-arguments.c).
  • Compile the code with gcc print-arguments.c -o print-arguments.
  • Run the executable with ./print-arguments test or ./print-arguments $USER.