simple wrapper script that appends date to file name

#!/bin/sh
#
# wrapper script, copies files before editing and appends date to file
#
cp "$@" "$@.`date +%y%b%d`"
vi "$@"
# ------------------------------------------------
# --> date +%y%b%d
# 17Jan28
# ------------------------------------------------
# --> date +%Y%b%d
# 2017Jan28
# ------------------------------------------------
# --> date +%Y%m%d
# 20170128
# ------------------------------------------------
# --> date +%Y-%m%d
# 2017-0128
# ------------------------------------------------
# --> date +%Y-%m-%d
# 2017-01-28
# ------------------------------------------------