C Program to Copy File into Another File

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This C Program copies a file into another file.

Here is source code of the C Program to copy a file into another file. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C Program to Copy a File into Another File
  3.  */
  4. #include <stdio.h>
  5.  
  6. void main(int argc,char **argv)
  7. {
  8.     FILE *fp1, *fp2;
  9.     char ch;
  10.     int pos;
  11.  
  12.     if ((fp1 = fopen(argv[1],"r")) == NULL)    
  13.     {    
  14.         printf("\nFile cannot be opened");
  15.         return;
  16.     }
  17.     else     
  18.     {
  19.         printf("\nFile opened for copy...\n ");    
  20.     }
  21.     fp2 = fopen(argv[2], "w");  
  22.     fseek(fp1, 0L, SEEK_END); // file pointer at end of file
  23.     pos = ftell(fp1);
  24.     fseek(fp1, 0L, SEEK_SET); // file pointer set at start
  25.     while (pos--)
  26.     {
  27.         ch = fgetc(fp1);  // copying file character by character
  28.         fputc(ch, fp2);
  29.     }    
  30.     fcloseall();    
  31. }

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$ cc file1.c
$ a.out /tmp/vmlinux mylinux
 
File opened for copy...
 
$cmp /tmp/vmlinux mylinux
 
$ ls -l mylinux
-rw-rw-r--. 1 adi adi 3791744 Jul 27 19:57 mylinux

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn