Answer by Jeff Schaller for Unzip archive with single file and rename output to match archive name

You could continue with the -d idea, and simply rename any extracted file to the desired "zip name minus the zip plus txt":

mkdir tmpfor f in *.zip; do unzip "$f" -d tmp && mv tmp/* "${f%.zip}.txt"; donermdir tmp

Alternatively, you could pipe the output from unzip into the appropriately-named file:

for f in *.zip; do unzip -p "$f"> "${f%.zip}.txt"; done