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Re: How to use redirection in a function so that the function callers do
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From: |
Chet Ramey |
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Subject: |
Re: How to use redirection in a function so that the function callers don't need to know such details? |
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Date: |
Mon, 6 Apr 2020 22:07:52 -0400 |
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Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 |
On 4/6/20 9:41 PM, Peng Yu wrote:
> Thanks. I wasn't aware of the usage `{fd1}<&0`. Where is it documented
> in man bash?
"Each redirection that may be preceded by a file descriptor number may
instead be preceded by a word of the form {varname}. In this case, for
each redirection operator except >&- and <&-, the shell will allocate a
file descriptor greater than or equal to 10 and assign it to varname.
If >&- or <&- is preceded by {varname}, the value of varname defines
the file descriptor to close. If {varname} is supplied, the redirect-
ion persists beyond the scope of the command, allowing the shell pro-
grammer to manage the file descriptor himself."
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU address@hidden http://tiswww.cwru.edu/~chet/