| 
 
| mkdir hello cd hello
 vi hellowrold.c
 i
 #include<stdio.h>
 int main(void)
 {
 printf("helloworld!\n");
 return 0;
 }
 Esc
 :wq
 
 
 gcc helloworld.c -o helloworld
 ./hello;
 
 
 
 touch Makefile
 vi Makefile
 i
 all
 (tab)gcc helloworld.c -o helloworld1
 (Esc):wq
 
 make
 ./helloworld1
 | 
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