"exec 9<$filename" means "redirect file to fd9, without dealing with fd0".
2006/10/9, Tony Nelson <tonynelson@xxxxxxxxxxxxxxxxx>:
At 11:46 PM +0800 10/9/06, ???? wrote:
>2006/10/9, Dan Track <dan.track@xxxxxxxxx>:
>> Hi
>>
>> I've got a script that should check which rpms are installed on the
>> system. Part of the script involves using file descriptors. I'm having
>> trouble understanding these file descriptors and was hoping someone
>> can clarify my mistake. As a simple script I wrote the following:
>>
>> #!/bin/bash
>> $filename=$1
>> $filename1=$2
>>
>> exec 9<&0 < $filename
>The line in the script "exec 9<&0 <$filename" means "first copy fd0 to
>fd9, then redirect file to fd0", so in the following lines of the
>script fd9 is always the stdin.
According to the Wikipedia link
exec 9<$filename
seems more likely.
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' is no more. <http://www.georgeanelson.com/>
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