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According to Eric Blake on 11/7/2006 6:35 AM:
Have you tried the experimental bash-3.2.3-5, and exporting SHELLOPTS in
your environment with igncr specified? Within bash, SHELLOPTS is
read-only, but reflects the current shell option settings, so you merely
need export it so that it is in the environment instead of a shell local
variable.
A slight clarification: once in bash, the read-only SHELLOPTS only tracks
actions involving 'set -o', it does not track actions involving 'shopt -s'
or other back doors to affecting shell options. I noticed this with the
'history' shell option as well as the 'igncr' shell option, so it is not
cygwin-specific; however, I'm not sure whether to call it a bug or a
feature in upstream handling of how SHELLOPTS is handled.