Example cat program

cat.c

// cc cat.c -o cat && ./cat cat.c

#include <stdio.h>

int main(int argc, char* argv[])
{
    char buf[1024];
    if(argc < 2) return 2;
    FILE* f = fopen(argv[1], "r");
    if(!f) return 1;
    do
    {
        size_t cnt = fread(buf, 1, sizeof(buf), f);
        fwrite(buf, 1, cnt, stdout);
    }
    while(!feof(f) && !ferror(f));
    return 0;
}