C Program to Copy One File to Another File

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.

```
/*
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 * C Program to Copy a File into Another File

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 */
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#include <stdio.h>
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```
 
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void main(int argc,char **argv)
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```
{
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    FILE *fp1, *fp2;
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    char ch;
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    int pos;
```
```
 
```

    if ((fp1 = fopen(argv[1],"r")) == NULL)

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    {    
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        printf("\nFile cannot be opened");

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        return;
```
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    }
```
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    else     
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    {
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        printf("\nFile opened for copy...\n ");

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    }
```
```
    fp2 = fopen(argv[2], "w");  
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    fseek(fp1, 0L, SEEK_END); // file pointer at end of file

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    pos = ftell(fp1);
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    fseek(fp1, 0L, SEEK_SET); // file pointer set at start

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    while (pos--)
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    {
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        ch = fgetc(fp1);  // copying file character by character

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        fputc(ch, fp2);
```
```
    }    
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```
    fcloseall();    
```
```
}
```

$ 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