Mail Archives: cygwin/2005/10/24/12:28:54
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On Mon, 24 Oct 2005, cygwin.20.maillinglist wrote:
> Hi folks
>
> I have the problem that I like to use read -u to read from file.
> The following script was stored under $HOME/bin/h
> ----------------------------------
> #!/bin/bash
> set -xv
> ls -l $HOME/bin/h
> 3<$HOME/bin/h
>
> while read -u 3
> do
> echo $REPLY
> done
> ----------------------------------
> The output of a run is
>
> ----------------------------------
> ls -l $HOME/bin/h
> 3: ls -l /cygdrive/c/home/bin/h
> -rwx------+ 1 F.Braunbeck Domänen-Benutzer 101 Oct 24 17:52 /cygdrive/c/home/bin/h
> 3<$HOME/bin/h
>
> while read -u 3
> do
> echo $REPLY
> done
> 6: read -u 3
> /cygdrive/c/home/bin/h: line 6: read: 3: invalid file descriptor: Bad file descriptor
> ---------------------------------
>
> How can I get it work so that no "Bad file descriptor" error comes out
Read the bash man page on input redirection. This is not how you redirect
input in the current bash process. Using
exec 3<"$HOME/bin/h"
while read -u 3; do echo $REPLY; done
works just fine for me. Note that you may want to quote $HOME...
Igor
--
http://cs.nyu.edu/~pechtcha/
|\ _,,,---,,_ pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`' -. ;-;;,_ igor AT watson DOT ibm DOT com
|,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D.
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