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From: Linda Walsh <bash@tlinx.org>
Newsgroups: gnu.bash.bug
Subject: BUG?: (or what's going on?) test for NL == NL fails (bash-4.3.39(3)-release)
Date: Sun, 02 Aug 2015 12:30:00 -0700
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>  printf "\n" |hexdump -C        
00000000  0a
>  printf "%s" $'\n'|hexdump -C
00000000  0a
>  if [[ $(printf "\n") == $'\n' ]]; then echo T; else echo F; fi
F

----
just noticed the problem doesn't happen if I try to use '\t' (tab)

>  printf "\t" |hexdump -C        
00000000  09
>  printf "%s" $'\t'|hexdump -C
00000000  09
>  if [[ $(printf "\t") == $'\t' ]]; then echo T; else echo F; fi
T