Linuxc language to clear the txt file

Answer 1

There are two ways to clear the txt-file in C language under Linux2:
1. Use the fopen() function: fopen is the standard library function of the C language. It uses the "w" mode to open the file. If the file name is the same as an existing file, the contents of the existing file will be deleted and the file will be treated as a new empty file. The sample code is as follows:
```c
#include
#include
int main() {
FILE * fp;
fp = fopen ("file.txt", "w");
fclose(fp);
return(0);
}
```
2. Use the fintercept () function: This is the system call function used to set the file size. To empty the file, set its length to 0. Remember to close the file description after using it. The sample code is as follows:
```c
#include
#include
int main() {
int fd = open("file.txt", O_RDWR);
ftruncate(fd, 0);
close(fd);
return 0;
}
```
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