Linux Program to Append to the End of a File using File Descriptors

This Linux Program illustrates Appending to the End of a File using File Descriptors.

Here is the source code of Linux Program to Append to the End of a File Using File Descriptors. The Linux Program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

* Linux Program to Append to the End of a File using File Descriptors.

```
*/
```
```
 
```
```
#include <stdio.h>
```
```
#include <stdlib.h>
```
```
#include <unistd.h>
```
```
#include <sys/types.h>
```
```
#include <sys/stat.h>
```
```
#include <fcntl.h>
```
```
#include <string.h>
```
```
 
```
```
int main(int argc, char **argv)
```
```
{
```
```
    int fd;
```
```
    char buf[20];
```
```
    size_t nbytes;
```
```
    ssize_t bytes_written;
```
```
 
```
```
    if (argc < 2) {
```

        printf("Usage : %s pathname\n", argv[0]);

```
        exit(1);
```
```
    }
```
```
 
```
```
    strcpy(buf, "This is a test\n");
```
```
    nbytes = strlen(buf);
```
```
 
```

    /* opening the file in append mode */

    if ((fd = open(argv[1], O_WRONLY | O_APPEND)) < 0) {

        perror("Problem in opening the file in append mode");

```
        exit(1);
```
```
    }
```
```
 
```
```
    /* writing to the file */
```

    if ((bytes_written = write(fd, buf, nbytes)) < 0) {

    	perror("Problem in writing to file");

```
    	exit(1);
```
```
    }
```

    printf("Successfully written to %s\n", argv[1]);

```
 
```
```
    close(fd);
```
```
}
```

 
$ gcc append_to_file.c
$ a.out my_file
 
Successfully written to my_file

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