linux编程命令

```c

include

include

int main() {

int fd = open("file.txt", O_RDONLY);

// Check for errors in opening file

if (fd == 1) {

perror("Failed to open file");

return 1;

}

char buffer[1024];

ssize_t bytes_read = read(fd, buffer, sizeof(buffer));

// Check for errors in reading file

if (bytes_read == 1) {

perror("Failed to read file");

close(fd);

return 1;

}

// Do something with the read data

close(fd);

return 0;

}

```

2.

进程管理

```c

include

include

int main() {

pid_t pid = fork();

if (pid == 0) {

// Child process

// Do something

_exit(0); // Exit child process

} else if (pid > 0) {

// Parent process

wait(NULL); // Wait for child process to finish

} else {

perror("Failed to fork");

return 1;

}

return 0;

}

```

3.

信号处理

```c

include

include

include

void sigint_handler(int signum) {

printf("Caught SIGINT\n");

}

int main() {

signal(SIGINT, sigint_handler);

while (1) {

// Do something

sleep(1);

}

return 0;

}

```

4.

文件操作

```c

include

include

int main() {

int fd = open("file.txt", O_WRONLY | O_CREAT | O_TRUNC, 0644);

// Check for errors in opening file

if (fd == 1) {

perror("Failed to open file");

return 1;

}

const char *data = "Hello, Linux!";

ssize_t bytes_written = write(fd, data, strlen(data));

// Check for errors in writing to file

if (bytes_written == 1) {

perror("Failed to write to file");

close(fd);

return 1;

}

close(fd);

return 0;

}

```

这些是 Linux 编程中的一些基本语法要点，希望能帮助到你开始 Linux 编程之旅。

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