bash stdout 和 /dev/stdout 之间的区别
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Difference between stdout and /dev/stdout
提问by Balaganesh
bala@hp:~$ echo "Hello World" > stdout
bala@hp:~$ cat stdout
Hello World
bala@hp:~$ echo "Hello World" > /dev/stdout
Hello World
Kindly clarify what is the difference between stdoutand /dev/stdout
请澄清之间有什么区别stdout和/dev/stdout
Note :
笔记 ：
bala@hp:~$ file stdout
stdout: ASCII text
bala@hp:~$ file /dev/stdout
/dev/stdout: symbolic link to `/proc/self/fd/1'
Kindly help to know the difference .
请帮助了解差异。
回答by Sourav Ghosh
In your case
在你的情况下
stdoutis a normal file, created in the same directory where you're running the command.So, when you're redirecting the output of
echotostdout, it is written to the file. You need to docat(as example, here you did) in order to see the content on screenhere./dev/stdoutis a devicefile, which is a link to/proc/self/fd/1, which means it is referring to the file descriptor 1 held by the current process.So, when you're redirecting the output of
echoto/dev/stdout, it is sent to the standard output (the screen) directly.
stdout是一个普通文件，在您运行命令的同一目录中创建。因此，当您将
echoto的输出重定向时stdout，它会被写入文件。您需要执行cat（例如，您执行此操作）才能在此处查看屏幕上的内容。/dev/stdout是一个设备文件，它是指向 的链接/proc/self/fd/1，这意味着它指的是当前进程持有的文件描述符 1。因此，当您将
echoto的输出重定向时/dev/stdout，它会直接发送到标准输出（屏幕）。
回答by paxdiablo
stdouton its own is just a file in the current directory, no different to finances.txt. It has nothing to do with the standard output of the process other than the fact you're redirecting standard output to it.
stdout本身只是当前目录中的一个文件，与finances.txt. 除了您将标准输出重定向到它的事实之外，它与进程的标准输出无关。
On the other hand, /dev/stdoutis a link to a special file on the procfsfile system, which represents file descriptor 1 of the process using it1.
另一方面，/dev/stdout是指向procfs文件系统上特殊文件的链接，它表示使用它的进程的文件描述符 1 1。
Hence it has a very real connection to the process standard output.
因此，它与过程标准输出有着非常真实的联系。
1The procfsfile system holds all sorts of wondrous information about the system and all its processes (assuming a process has permissions to get to them, which it should have for /proc/self).
1该procfs文件系统拥有各种有关系统的所有进程（假设一个进程的权限才能上，它应该有一个奇妙的信息/proc/self）。
回答by Some programmer dude
One is a normal file, no different from any other normal file like e.g. ~/foobar.txt.
一个是普通文件，与任何其他普通文件（例如~/foobar.txt.
The other is a symbolic link (like one you can create with ln -s) to a special virtual file that represents file descriptor 1 in the current process.
另一个是ln -s到一个特殊虚拟文件的符号链接（就像你可以创建的那样），该文件代表当前进程中的文件描述符 1。
