How To Create DOS Command In C

Step 1: Write following code.

#include<stdio.h>
 

void main(int count,char * argv[])

{

int i;

FILE *ptr;

char *str;

char ch;

if(count==1)

{

printf("The syntax of the command is incorrect.\n");

}

for(i=1;i<count;i++)

{

ptr=fopen(argv[i],"r");

if(ptr==NULL)

{

printf("The system cannot find the file specified.");

if(count>2)

printf("\nError occurred while procesing : %s.\n",argv[i]);

}

else

{

if(count>2)

{

printf("%s\n\n",argv[i]);

}

while((ch=getc(ptr))!=-1)

printf("%c",ch);

}

fclose(ptr);

}

}

Step 2: Save the as open.c (You can give any name)

Step 3: Compile and execute the file.

Step 4: Write click on My computer of Window XP

operating system and select properties.

Step 5: Select Advanced -> Environment Variables

Step 6: You will find following window:

Click on new button (Button inside the red box)

Step 7: Write following:

Variable name: path

Variable value: c:\tc\bin\open.c  (the path where you have saved)

Step 8: Open command prompt and write open then file name and press enter button.