Unix Shell - Re: "cat <> file" and "echo "ddd" >&2 2>&am

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Re: "cat <> file" and "echo "ddd" >&2 2>&am

John DuBois

2007-08-22, 1:23 pm

In article <fa9em7$e8h$1@news.yaako.com>, Key9 <publicaccept@163.com> wrote:
>which "fd" be used on earth?
>Is there any way to display what fd be used?
>like :
>$echo "ddd"
>1:ddd

If you're wondering how to tell which of the open fds that a program inherits
it is writing output to, this utility may help:
ftp://ftp.armory.com/pub/scripts/fdshow

Example:

$ fdshow echo ddd
1: ddd

John
--
John DuBois spcecdt@armory.com KC6QKZ/AE http://www.armory.com/~spcecdt/