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Re: BUG?: (or what's going on?) test for NL == NL fails (bash-4.3.39(3)-

From: Charles Daffern
Subject: Re: BUG?: (or what's going on?) test for NL == NL fails (bash-4.3.39(3)-release)
Date: Sun, 2 Aug 2015 22:15:45 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.0.1

On 02/08/15 21:30, Linda Walsh wrote:
> Am just looking for an efficient way to test for 0x0a
> as last char in a var, ... after another 20 minutes of
> trying things at random, found this:
>  > printf "%d\n" "'${a:0-1:1}'"
>  10
> Oddly, the final single quote in the string seems unnecessary.
> But that (or into a var: printf -v var) both work...but I
> feel a bit contorted trying so many odd ways to get something
> that I thought would be simple, to work.

Most of the problems here are due to the use of command substitution (as
I mentioned in an earlier response).
The ways I would go about checking for a newline at the end of a string are:

[ "$var" != "${var%$'\n'}" ]
[[ $var = *$'\n' ]]

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