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Re: ${p+\"$p\"}

From: Chet Ramey
Subject: Re: ${p+\"$p\"}
Date: Mon, 21 Jan 2019 09:37:02 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.3.3

On 1/21/19 8:14 AM, Dan Jacobson wrote:
> So how am I to get
> "A"
> with bash?

echo ${p+\"$p\"}

> $ cat z
> p=A
> cat <<EOF
> ${p+\"$p\"}
> ${p+"$p"}
> $ bash z
> \"A\"
> A

It's the here-document. Backslashes and double quotes in here documents are
kind of strange. This is historical sh behavior.

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/

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