<<< Solution for Question #1 >>

#!/bin/bash

if [ $# -ne 1 ]
then
  echo "USAGE: $0 [dir-name]" >&2
  exit 1
fi
 
if [ ! -d $1 ]
then
  echo "Error, directory pathname \"$1\" is not valid" >&2
  exit 1
fi

firstArg=$1

set $(ls -a $1)

echo "The total number of files in \"$firstArg\" is: $#"


<< Solution for Question #2 >>


#!/bin/bash

dirpathname=$1

if [ $# -ne 1 ]
then
  echo "USAGE: $0 [dir-name]" >&2
  exit 1
fi

if [ ! -d $1 ]
then
  echo "Error, directory pathname \"$1\" is not valid" >&2
  exit 1
fi

set $(ls -a $1)

echo "The total number of files in \"$dirpathname\" is : $#"


<< Solution for Question #3 >>

Standard Output is:

$*
0
Yippee!Boo!
Done!
`