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Re: How to replace with `$1` literally?
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From: |
Marc Chantreux |
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Subject: |
Re: How to replace with `$1` literally? |
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Date: |
Mon, 8 Aug 2016 09:17:55 +0200 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Sun, Aug 07, 2016 at 11:30:04PM -0500, Peng Yu wrote:
> Hi, The following code is not able to replace ENV with `$1`.
>
> /tmp$ m4 -D ENV='$1' <<< ENV
you can add a empty string between $ and 1 to avoid interpolation. to do
so, your m4 content must be $`'1, not $1.
if your using a shell with rc quoting (rc, es or zsh with rcquotes
option enabled), you can write:
m4 -D ENV='$`''1' <<< ENV
the more readable posix way that comes to my mind is
m4 -D ENV=$\`\'1 <<< ENV
regards
marc