#!/bin/sh

# mostly if_demo3 from Sarwar, Koretsky, Sarwar (2001), pp. 424-6
# modified to show both test and [ ] forms of if statements

if test $# -eq 0    # basic form of test
then
  echo "Usage: $0 file"
  exit 1
elif test $# -gt 1
then
  echo "Usage: $0 file"
  exit 1
else
  ls "$1" 2> /dev/null 1>&2  # redirects stderr to black hole, and
                             # then redirects stdout to stderr, so
                             # only effect is: set $? - the err flag
                             # depending on file's existence

  if test $? -ne 0
  then
    echo "$1: not found in the present working directory."
    exit 1
  fi

  if [ -f "$1" ]   # switched to short form of test
  then
    filename="$1"
    set `ls -il $filename`   # reset command line args to file list
    inode="$1"
    size="$6"
    echo "Name : Inode : Size"
    echo "$filename : $inode : $size"
    exit 0
  elif [ -d "$1" ]
  then
    nfiles=`ls "$1" | wc -w`
    echo "The number of files in the directory is $nfiles"
    exit 0
  else
    echo "$0: argument must be an ordinary file"
  fi
fi