Wow! This parameter expansion stuff is COOOOOL!!!
Phillip
On Sat, Jun 21, 2003 at 02:45:46PM -0600, Soren Harward wrote:
> Stuart Jansen wrote:
> > FILE=$(echo $FILE | sed 's/....$//'
> >
> > Regular expressions are such useful things. KSH has some built in RE
> > functions, that I think make it possible to do all this without forking.
> > Bash might also.
>
> Ooh, ooh! I just learned how to do this this week! Bash can indeed
> manipulate strings like this when you're working with environment
> variables. I don't think it's got full regexp support, but it's still
> pretty powerful. If you want to chop the last four characters off the
> value in VARNAME, then do this:
>
> ${VARNAME%%????}
>
> or this:
>
> ${VARNAME::$((${#VARNAME}-4))}
>
> If you want to do a replacement within the variable, then you can do:
>
> ${VARNAME/find/replace}
>
> For example:
>
> for FILE in *mp3; do
> mv $FILE ${FILE%%mp3}ogg;
> done
>
> changes all the extensions of the .mp3 files in your directory to .ogg
> (though it would probably be a good idea to re-encode them in the process).
>
> Look up "Parameter Expansion" in the bash manpage.
>
> Oh yeah, it would be pretty hard to do this just with cut, because there
> isn't a way to specify "N characters from the end of the string." Use
> sed or bash parameter expansion instead.
>
> --
> Soren Harward
> [EMAIL PROTECTED]
>
>
>
>
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--
Phillip Hellewell <[EMAIL PROTECTED]>
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