Re: [gentoo-dev] escaping variables in sed expressions

[Ulrich Mueller]

>>>>> On Tue, 15 Apr 2008, Marijn Schouten (hkBst) wrote:

> There are several option to handle this. I could use a less common
> delimiter or I could escape it: ${D//_/\_} instead of ${D}. I could
> use a sed expression that doesn't suffer from this problem (thanks
> to dleverton):

> sed -ne '\_^prefix = /usr/local_!{p;d}' -e "iprefix = ${D}" -i Makefile

Hi Marijn,

both approaches won't work since you would have to escape not only the
pattern delimiter, but also sed special characters (like "\" and "&")
_and_ make special characters (e.g. the dollar sign).

Probably better to pass it to make via a command argument or
environment variable.

Ulrich
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