UNIX for Dummies Questions & Answers

#!/bin/sh
#-----------------------------------------------------------------#
#             FUNCTIONS USED BY THIS SCRIPT                       #
#-----------------------------------------------------------------#
usage()
{
        echo "Usage: $0 [ Interactive ] [ AutoInstall ] "
        echo "  AutoInstall is the Prefered method for Installation "
        echo
        echo "--------------------------------------------------------------------"
        echo "Interactive Mode:"
        echo "  You will be asked a series of questions regarding Installation configuration"
        echo "          You can press enter to these questions. Default settings will be used. "
        echo "          If you change a default. you will be asked to confirm the changes [ Y / N ]"
        echo "          You must choose Y [ for Yes ] or N [ for No ] in order to proceed "
        echo
        echo
        echo "AutoInstall Mode:         *** Prefered Method  ***"
        echo "  This method will install the Software with all defaulted answers"
        echo "  This is the Preferred method for Installation."
        echo " "
        echo "Would you like to view the readme file for help? [ Y / N ]"
        read ans
        Answer=${ans}
        check_ans ${Question} ${Answer}
                ans1=`echo $ans |tr '[a-z]' '[A-Z]'`
                if [ ${ans1} = "Y" ]
                then
                more readme.txt
                clear
        echo "Usage: $0 [ Interactive ] [ AutoInstall ] "
        echo "  AutoInstall is the Prefered method for Installation "
                fi
        echo
        exit 1
}
#-----------------------------------------------------------------#
check_ans()
{
        echo $Question
        echo $Answer
MyQuestion=$Question
MyAnswer=$2
        if [[ ! -n $Answer ]]
        then
                echo "${Question}"
                echo "Please Choose [ Y or N  ]"
                return 0
        fi
        echo $Answer >> $LOGOUT
        return 1
}
#-----------------------------------------------------------------#
directory_build()
{
# Ensure the installation root directory exists.
if [ ! -d ${INSTALL_ROOT} ]
then
    mkdir -p ${INSTALL_ROOT}
    if [[ $? -ne 0 ]]
    then
        echo "Error creating ${INSTALL_ROOT}; installation failed."  | tee -a ${LOGOUT}
        exit 1
    fi
fi

}

#-----------------------------------------------------------------#
check_kit()
{
    # Make sure we have only one webserver kit in this directory
    WEBSERVER_TAR_FILE_COUNT=`ls $KIT_SEARCH_NAME | wc -l`
    #echo tar file count is : $WEBSERVER_TAR_FILE_COUNT

    if [ $WEBSERVER_TAR_FILE_COUNT -eq 0 ]
    then
        echo "No kit found. Nothing to do."  |$ tee -a ${LOGOUT}
        exit 1
    fi

    if [ $WEBSERVER_TAR_FILE_COUNT -gt 1 ]
    then
        echo "Multiple kits found. Remove extra files from this directory and re-run."  | tee -a ${LOGOUT}
        ls -l $KIT_SEARCH_NAME
        exit 1
    fi

    # Set the name of the webserver kit.
    WEBSERVER_TAR_FILE=`ls $KIT_SEARCH_NAME | head -1`
        echo "${WEBSERVER_TAR_FILE} Will be used to install"  | tee -a ${LOGOUT}
}

process_defaults()
{
        echo "Processing Default configuration"  | tee -a ${LOGOUT}
}
#-----------------------------------------------------------------#
process_interactive()
{
        INSTALL_ROOT=/tmp/username
        echo "Where would you like to install the software? The default is : [ /tmp/username ]"  | tee -a ${LOGOUT}
        read line
        if [[ ! -n $line ]]
        then
                INSTALL_ROOT=/home/users/sbin
        else
                if [ ${line} != $INSTALL_ROOT ]
                then
                        INSTALL_ROOT=$line
                echo "You chose to install in the following PATH [ $line ]. Are you sure ? [Y / N] "  |tee -a ${LOGOUT}
                Question="Custom INSTALL_ROOT [ Y or N ]"
                while read ans
                        do
                        Answer=`echo $ans |tr '[a-z]' '[A-Z]'`
                        check_ans ${Question} ${Answer}
                                if [[ $? != 0 ]]
                                then
                                        break
                                fi
                        done

                        if [ ${Answer} != "Y" ]
                        then
                                process_interactive
                        fi
                fi
        fi
        echo "INSTALLATION PATH will be [ ${INSTALL_ROOT} ]"  | tee -a ${LOGOUT}
#######
        echo ""
        echo "I notice you have an httpd server already running"
        echo "" |tee -a ${LOGOUT}
        echo "Would you like to use your existing httpd server or install Shttpd for our product?" |tee -a ${LOGOUT}
        echo "Use existing httpd? [ Y or N ]" |tee -a ${LOGOUT}
        Question="Use existing httpd? [ Y or N ]"
        while read ans
        do
        Answer=`echo $ans |tr '[a-z]' '[A-Z]'`
        check_ans ${Question} ${Answer}
        if [[ $? != 0 ]]
        then
                break
        fi
        done
                if [ ${Answer} != "Y" ]
                then
                echo "Installing Shttpd for  web client"  | tee -a ${LOGOUT}
        echo ""  | tee -a ${LOGOUT}
                else
                echo "EXISTING WEB SERVER will be used"  | tee -a ${LOGOUT}
        echo ""  | tee -a ${LOGOUT}
                fi

        check_kit

}
############# END OF FUNCTIONS

#-----------------------------------------------------------------#
# BEGIN MAIN PROCESSING OF SCRIPT
#-----------------------------------------------------------------#
if [ $# -eq 0 ]
then
        usage
else

# DEFINE GLOBAL VARIABLES HERE
KIT_SEARCH_NAME=test.file
INSTALL_ROOT=/tmp/usersname
LOGPATH=/tmp
LOGFILE=Installation.log
LOGOUT=${LOGPATH}/${LOGFILE}

if [ -f ${LOGOUT} ]
then
        echo "Logfile already exists. I Will rename to a timestamp.log"
        stat_time=`stat -c "%x" ${LOGOUT} |awk -F . '{print $1}'`
        logstamp=`echo ${stat_time}|awk '{print $1"_"$2}'`
        mv  ${LOGOUT} ${LOGPATH}/${logstamp}.${LOGFILE}
        echo " ${LOGFILE} was renamed to ${LOGPATH}/${logstamp}.${LOGFILE}"
        echo "----------------------------------------------------------------------"
        #create new logoutfile now
        touch ${LOGOUT}
        echo "Created new Logfile ......continuing installation..."
        echo ""
        echo "Installation Process" >> ${LOGOUT}
        echo "`date +%Y-%m-%d-%H:%M:%S` Begin Installation" >> ${LOGOUT}
        echo ""

else
        touch ${LOGOUT}
        echo "Installation Process" >> ${LOGOUT}
        echo "`date` Begin Installation" >> ${LOGOUT}
        echo ""
fi

        if [ "$1" != "Interactive" ]
        then
                if [ "$1" != "AutoInstall" ]
                then
                        echo "Unknown Option"
                        usage
                fi

          INTERACTIVE=0
          echo "NEED TO CONFIGURE DEFAULTS" | tee -a ${LOGOUT}
          echo "Processing AutoInstall Mode of Installaion" | tee -a ${LOGOUT}
          echo ""

        else
          echo "Processing Interactive Installaion"  | tee -a ${LOGOUT}
          echo ""
          INTERACTIVE=1
        fi
fi

#-----------------------------------------------------------------#
# Find out what OS is running
this_os=`uname -s`

case $this_os in
    AIX )
        ECHO_PREFIX=
        ECHO_SUFFIX=\\c
    ;;
    * )
        ECHO_PREFIX=-n
        ECHO_SUFFIX=
    ;;
esac

echo "Operating system is ${this_os}" | tee -a ${LOGOUT}
echo "" |tee -a ${LOGOUT}
#-----------------------------------------------------------------#

#-----------------------------------------------------------------#
# Make sure root user is the one executing this script
if [ "${LOGNAME}" != "root" ]
then
    echo "Must be root to run $0. Current user is ${LOGNAME}"  | tee -a ${LOGOUT}
    exit 1
fi
#-----------------------------------------------------------------#
if [ $INTERACTIVE = "0" ]
then
        process_defaults
else
        process_interactive
fi

while read; do

while true; do
   echo -n "Prompt for path: ";
   read path
   while true; do 
      echo -n "Are you sure? Y/N";
      read yesno
      if [ x$yesno == xY ]; then
        break 2;
      elif [ x$yesno == xN ]; then 
        continue 2;
      else
        continue;
      fi
  done
done

echo >&2 "Entering function process_interactive"

set -x