Tim Waugh wrote:
> There still doesn't seem to be a way to write expressions that work in
> 3.2 and in 3.1. For example, below is an expression that works fine in
> 3.1. How do I re-write it so that it (a) continues to work with
> bash-3.1, and (b) also works with bash-3.2?
>
> { cat "$file" ; echo ; } | while read line; do
> if [[ ! "$line" =~ '^[[:space:]]*(\#.*)?$' ]]; then
> /sbin/ip rule del $line
> fi
> done
>
> In particular, when the whole thing is de-quoted bash-3.1 seems to
> require the parentheses to be escaped, while bash-3.2 seems to require
> that they are *not* escaped.
The easiest thing to do is probably to assign the regular
expression to a variable. You may need to conditionally assign it
based on the value of $BASH_VERSION, but probably not.
This would have worked before and after any patches or changes to
bash-3.2.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
Live Strong. No day but today.
Chet Ramey, ITS, CWRU [EMAIL PROTECTED] http://cnswww.cns.cwru.edu/~chet/
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