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tr -d deletes all occurances of the list of characters it gets eg try tr -d ',123' and see what it does.

sed is probably the way to go here try:

echo '..., word1, word2, word3...' | sed...

If you are trying to delete literal dots (...) and not something else:


echo '..., word1, word2, word3...' | sed 's/\.\.\.,*//g'

awk ' /'"$a"'/ {flag=1;next} /'"$b"'/{flag=0} flag { print }' file