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1.5.9: Trouble with setting variables using 'read' in a script
- From: Kevan Gelling <Kevan dot Gelling at euphony dot co dot uk>
- To: "'cygwin at cygwin dot com'" <cygwin at cygwin dot com>
- Date: Thu, 6 May 2004 13:40:51 +0100
- Subject: 1.5.9: Trouble with setting variables using 'read' in a script
I'm having trouble setting variables using the 'read' command in bash.
All of the following lines fail to set $var and return a blank line.
- echo "text" | read var ; echo $var
- cat file | read var ; echo $var
- read var < file | echo $var
I can get it work by explicitly declaring the file descriptor with the file
redirection, but I'd prefer to use a pipe.
- read -u 0 var <file ; echo $var
Another related quirk, is that variables set within 'while read' loops lose
their values once the loop ends. The following example displays "text text"
within the loop and blank line outside.
- echo "text" |\
while read
do
foo=$REPLY ; bar="text"
echo $foo $bar
done
echo $foo $bar
Is this a feature of bash or a bug? If it is a feature is there a
workaround?
My setup is Cygwin 1.5.9-1 and Bash 2.05b-16 under Windows XP Pro 5.1 SP1
Thanks,
Kevan
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