#! /bin/sh

echo "\$# = $#"
for a
do
  echo "a = $a"
done
echo "\$0 = $0"
echo "\$1 = $1"
echo "\$2 = $2"
echo "\$3 = ${3}"
x="abc"
echo "\$x = $x"
echo "\$xy = $xy"
echo "\${x}y = ${x}y"

# sample run:
# $ ./x.sh a bb ccc
# $# = 3
# a = a
# a = bb
# a = ccc
# $0 = ./x.sh
# $1 = a
# $2 = bb
# $3 = ccc
# $x = abc
# $xy =
# ${x}y = abcy
# $