for f in *; do echo "mv $f `echo $f | sed 's/.txt//'`"; done;

# mv 01-README.txt 01-README
# mv for for
# mv for2 for2
# mv push push

# GNU bash, version 3.1.16(1)-release (i686-pc-linux-gnu)
# Copyright (C) 2005 Free Software Foundation, Inc.