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Re: [Help-bash] substitution causing issues in ssh to remote host backti

From: Chet Ramey
Subject: Re: [Help-bash] substitution causing issues in ssh to remote host backtick
Date: Fri, 08 Aug 2014 13:23:55 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 8/8/14, 11:26 AM, Rajeev Prasad wrote:
> hello friends,
> can someone help understand why 1st is working but second is not?
> working:
> ssh server10 'for t in `ls /xyz/abc/lmn|grep -v xxx`;do ls /xyz/abc/lmn/$t | 
> sed -e "s/some/someelse/";done'
> not working:
> host=server10
> folder=/xyz/abc/lmn
> ssh $host 'for t in `ls $folder|grep -v xxx`;do ls $folder/$t | sed -e 
> "s/some/someelse/";done'
> it seems substitution inside backtick is causing the failure, but i am not 
> able to understand why?

The single quotes inhibit variable expansion in the context where you want
it to take place.

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden

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