1. script1 - Write a script that will test for three arguments. If those
arguments are not present, prompt the user for those missing arguments.

2. script2 - Write a shell script that will loop through the arguments
on the command line and display them to the screen only if they are UNIX files.

3. script3 - Write a shell script that will extract, sort and list all
users' names on the screen.

4. script4 - Write a script that tells you whether the permissions for two
file, whose names are given as arguments to the script are identical. If the
permissions for the two files are identical, display the permission field;
otherwise, display each file name followed by its permissions.

5. script5 - Write a script that takes the name of a directory as an
argument and searches the file heirarchy at that specific directory for
any files that have zero lengths. Write the names of any zero length files
to standard output.

6. discover - Write a script to discover other IP devices on the local subnet.






/home/cis130/simmsric/project $ cat script1
#!/bin/bash
#
# CIS 130 Final Project Scripts
#
# Rich Simms
# Spring 2007
#
# script1 - Test for three arguments.  If those arguments are not present,
#           prompt for them.
#
# usage: script1 [-d] [arg1] [arg2] [arg3]
#
#            options -d enables debug tracing
#            arg1, arg2, arg3 - any test arguments
#

# Initialize
usage="script1 [-d] [arg1] [arg2] [arg3]"
TRUE=1
FALSE=""

# Process options
trace=$FALSE
while getopts ":d" opt; do
  case $opt in
     d) trace=$TRUE ;;
     *) echo "-- Usage: " $usage >&2
        exit 1 ;;
  esac
done

# Shift out any options
if [ $OPTIND -ge 1 ]; then shift $(($OPTIND - 1)); fi

[ $trace ] && echo "$# arguments found on command line"

for i in 1 2 3
do
  if [ $# -eq 0 ]; then
    echo -n "Enter argument $i: "
    read arg[$i]
  else
    arg[$i]=$1
  fi
  shift
done

echo "arg1=${arg[1]}, arg2=${arg[2]}, arg3=${arg[3]}"

exit 0

/home/cis130/simmsric/project $ cat script2
#!/bin/bash
#
# CIS 130 Final Project Scripts
#
# Rich Simms
# Spring 2007
#
# script2 - Test for three arguments.  If those arguments are not present,
#           prompt for them. If they are are UNIX files then display them.
#
# usage: script2 [-d] [arg1] [arg2] [arg3]
#
#            options -d enables debug tracing
#            arg1, arg2, arg3 - any test arguments
#

# Initialize
usage="script2 [-d] [arg1] [arg2] [arg3]"
TRUE=1
FALSE=""

# Process options
trace=$FALSE

while getopts ":d" opt; do
  case $opt in
     d) trace=$TRUE ;;
     *) echo "-- Usage: " $usage >&2
        exit 1 ;;
  esac
done

# Shift out any options
if [ $OPTIND -ge 1 ]; then shift $(($OPTIND - 1)); fi

[ $trace ] && echo "$# arguments found on command line"

for i in 1 2 3
do
  if [ $# -eq 0 ]; then
    echo -n "Enter argument $i: "
    read arg[$i]
  else
    arg[$i]=$1
  fi

  if [ -f ${arg[$i]} ]; then
     ls -l ${arg[$i]}
  fi

  shift
done

[ $trace ] && echo "arg1=${arg[1]}, arg2=${arg[2]}, arg3=${arg[3]}"

exit 0



/home/cis130/simmsric/project $ cat script3
#!/bin/bash
#
# CIS 130 Final project Script3
#
# Rich Simms
#
#
# This script prints all user names in /etc/passwd to the screen.
#
# usage: script3 [-d] (where d = debug tracing on)
#

# Initialize
usage="script3 [-d]"

# Process debug option (-d)
while getopts ":d" opt; do
  case $opt in
     d) debug="y"
          echo "** Debug tracing enabled" ;;
     *) echo "-- Usage: " $usage >&2
          exit 1
  esac
done

# Shift out any options
if [ $OPTIND -ge 1 ]; then shift $(($OPTIND - 1)); fi

tempfile="/tmp/tmp$$"  #restore when Opus /tmp is fixed
#tempfile="tmp$$"        #and comment out this one

> /tmp/tmp$$

while read inputline
do
  login="$(echo $inputline | cut -d: -f1)"
  uid="$(echo $inputline   | cut -d: -f3)"
  fulln="$(echo $inputline | cut -d: -f5)"
  if [ "$debug" = "y" ]; then
    echo "** trace: login=$login, uid=$uid, fulln=$fulln"
  fi
  if [ $uid -ge 99 ] && [ "$fulln" != "" ] ; then        #ignore system uid's
    echo "$fulln" >> $tempfile
  fi
done < /etc/passwd

cat $tempfile | sort

rm $tempfile

exit 0
/home/cis130/simmsric/project $ cat script4
#!/bin/bash
#
# CIS 130 Final Project Scripts
#
# Rich Simms
# Spring 2007
#
# script4 - Test for files having identical permissions. If they are
#           identical, display the permission field otherwise print each
#           file name and their permissions.
#
# usage: script4 [-d] [file1] [file2]
#
#            options -d enables debug tracing
#            file1, file2 - file names
#

# Initialize
usage="script4 [-d] [file1] [file2]"
TRUE=1
FALSE=""

# Process options
trace=$FALSE
while getopts ":d" opt; do
  case $opt in
     d) trace=$TRUE ;;
     *) echo "-- Usage: " $usage >&2
        exit 1 ;;
  esac
done

# Shift out any options
if [ $OPTIND -ge 1 ]; then shift $(($OPTIND - 1)); fi

[ $trace ] && echo "$# arguments found on command line"

# Check for two arguments
if [ $# -ne 2 ]; then
   echo "-- Usage: " $usage >&2
   exit 1
fi

# Check that they are file names
file1=$1
if [ ! -f $file1 ] ; then
   echo "-- $file1 is not a file"
   exit 1
fi
shift
file2=$1
if [ ! -f $file2 ] ; then
   echo "-- $file2 is not a file"
   exit 1
fi

# Get permissions of each file

perm1=$(ls -l $file1 | cut -c2-10)
perm2=$(ls -l $file2 | cut -c2-10)

[ $trace ] && echo "perm1=$perm1"
[ $trace ] && echo "perm2=$perm2"

if [ "$perm1" = "$perm2" ] ; then
   echo "$perm1"
else
   echo "$file1: $perm1"
   echo "$file2: $perm2"
fi

exit 0

/home/cis130/simmsric/project $ cat script5
#!/bin/bash
#
# CIS 130 Final Project Scripts
#
# Rich Simms
# Spring 2007
#
# script5 - Write a script that takes the name of a directory as an
# argument and searches the file heirarchy at that specific directory for
# any files that have zero lengths. Write the names of any zero length files
# to standard output.
#
# usage: script5 [-d] [directory]
#
#            options -d enables debug tracing
#

# Initialize
usage="script5 [-d] [directory]"
TRUE=1
FALSE=""

# Process options
trace=$FALSE
while getopts ":dla" opt; do
  case $opt in
     d) trace=$TRUE ;;
     *) echo "-- Usage: " $usage >&2
        exit 1 ;;
  esac
done

# Shift out any options
if [ $OPTIND -ge 1 ]; then shift $(($OPTIND - 1)); fi

[ $trace ] && echo "$# arguments found on command line"

# Check for one arguments
if [ $# -ne 1 ]; then
   echo "-- Usage: " $usage >&2
   exit 1
fi

# Check that argument is a directory
directory=$1
if [ ! -d $directory ] ; then
   echo "-- $directory is not a directory"
   exit 1
fi

# Loop through files in directory and print any with zero length
cd $directory
[ $trace ] && echo "*** Trace: We are now in: $(pwd)"
[ $trace ] && echo "*** Trace: $(ls)"
for i in *
do
  if [ -f $i ] ; then
    length=$(ls -l $i | cut -d' ' -f6)
    [ $trace ] && echo "*** Trace: $i length=$length"
    if [ $length -eq 0 ] ; then
       # print file name
       ls -l $i | sed -e 's/\(^.*\)\( \)\(.*$\)/     \3/g'
    fi
   fi
done

exit 0



/home/cis130/simmsric/project $ cat discover
#!/bin/bash
#
# CIS 130 Final Project Scripts
#
# Rich Simms
# Spring 2007
#
# discover -  This script discovers local ip neighbors
#             on the local subnet.  It does a broadcast then
#             dumps the arp cache.
#
# usage: discover [-d] (where d = debug tracing on)
#

# Initialize
usage="discover [-d]"

# Process debug option (-d)
while getopts ":d" opt; do
  case $opt in
     d) debug="y"
          echo "** Debug tracing enabled" ;;
     *) echo "-- Usage: " $usage >&2
          exit 1
  esac
done

# Shift out any options
if [ $OPTIND -ge 1 ]; then shift $(($OPTIND - 1)); fi

x=`/sbin/ifconfig`
bcast=${x#*eth0 *Bcast:}
bcast=${bcast%% *}
[ $debug ] && echo "Broadcast address for eth0: $bcast"
[ $debug ] && ping -b -c 2 $bcast
ping -b -c 2 $bcast > /dev/null 2> /dev/null
/sbin/arp -a | cut -f1,2 -d' '
[ $debug ] && /sbin/arp -a
exit 0
/home/cis130/simmsric/project $