10-28-2015
I can't see a path to the "nomenclature" function, so any advice here is speculative. And, there may be multiple variants the user entered, what is to be done if one, or several, or all of those do have a +/- sign in them?
Anyhow, try parameter expansion to test for sign existence: [ "$variant" == "${variant#*[+-]}" ] && echo equal || echo different
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