What is /dev/tty in UNIX?

最新推荐文章于 2024-10-06 23:52:48 发布

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最新推荐文章于 2024-10-06 23:52:48 发布

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本文详细解释了在UNIX系统中，/dev/tty作为文件系统对象代表当前控制台的功能。通过使用cp命令将文件复制到此目录下，可以从命令行打印文件内容。此外，这些对象允许使用文件API与控制台交互，类似于与常规文件的操作，如使用fopen、fprintf等函数。

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What is /dev/tty in UNIX?

dev/tty is a file system object that represents the current console. Copying files into this "directory" from the command line prints out the content of these files to your console:

cp myfile.txt /dev/tty

is equivalent to

cat myfile.txt

These objects are there to let you use the familiar file APIs to interact with console. It is a clever way to unify console API with file API. You can usefopen, fprintf, etc. to interact with the console in the same way that you interact with regular files.

This example writes "Hello, world\n" to the terminal:

#include <stdio.h>

int main (int argc, const char * argv[]) {
    FILE *f = fopen("/dev/tty", "w");
    fprintf(f, "Hello, world!\n");
    return 0;
}