bash - echo输出到stderr(echo that outputs to stderr)

Question

Is there a standard Bash tool that acts like echo but outputs to stderr rather than stdout?

(是否有一个标准的Bash工具，它像echo一样输出到stderr而不是stdout？)

I know I can do echo foo 1>&2 but it's kinda ugly and, I suspect, error prone (eg more likely to get edited wrong when things change).

(我知道我可以做echo foo 1>&2但它有点难看，我怀疑，容易出错（例如，当事情发生变化时更有可能被编辑错误）。)

  ask by BCS translate from so

Answer 1

You could do this, which facilitates reading:

(你可以这样做，这有助于阅读：)

>&2 echo "error"

>&2 copies file descriptor #2 to file descriptor #1.

(>&2文件描述符＃ >&2复制到文件描述符＃1。)

Therefore, after this redirection is performed, both file descriptors will refer to the same file: the one file descriptor #2 was originally referring to.

(因此，在执行此重定向之后，两个文件描述符将引用相同的文件：一个文件描述符＃2 最初是指。)

For more information see the Bash Hackers Illustrated Redirection Tutorial .

(有关更多信息，请参阅Bash Hackers Illustrated Redirection Tutorial 。)