ans  =
 
    1.  
 
-->exec('Example2.sci')
 
-->clear
 
-->flag=1
 flag  =
 
    1.  
 
-->mode(-1)
Current date is 23-Jun-2013 
 
Welcome to the Textbook Companionship Project 2013 
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 Book Title                             :       UNIX CONCEPTS AND APPLICATIONS    
 
 Book Edition                         :                                                                           4   
 
 Book Author                          :                                                    Sumitabha Das   
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 Code Author                          :                                                     Pranav Bhat T   
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 Chapter Number                    :                                                                            21   
 
 Chapter Title                         :                                Advanced Shell Programming   
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Example 2    :               Show the method of calling functions in shellscripts 
 
 ****************************************************************   
 
 Answer    :      
 
 INSTRUCTIONS   :    

1. Here all instructions are preloaded in the form of a demo

Initially the whole perl script is displaying and then 
 the result of the same can be seen in the command line interpreter.

2. PLEASE MAKE SURE THAT THE PERLSCRIPT INTERPRETER
EXISTS IN THE SYSTEM
OR THE COMMAND WOULD NOT WORK 

3. PRESS ENTER AFTER EACH COMMAND to see its RESULT

5. PRESS ENTER AFTER EACH RESULT TO GO TO THE NEXT COMMAND
.............Press [ENTER] to continue.....	UNIX SHELL SIMULATOR(DEMO VERSION WITH PRELOADED COMMANDS)



# Enter the name of the shellscript file whichever you desire  

 #! /bin/sh
# Script: user_passwd.sh - Uses a shell function
#
.mainfunc.sh                     # Script containing valid_string function

valid_string() {
    while echo "$1 \c" 1>&2 ; do
         read name
         case $name in
                "") echo "Nothing entered" 1>&2 ; continue ;;
                 *) if [ `expr "$name" : '.*'` -gt $2 ] ; then
                       echo "Maximum $2 characters permitted" 1>&2
                    else
                       break
                    fi ;;
         esac
    done
    echo $name
}

user=`valid_string "Enter your user-id :" 16`
stty -echo                     # Password not to be echoed
password=`valid_string "Enter your password:" 5`
stty echo                      # Turns on echoing facility
echo "\nYour user-id is $user and your password is $password"
 
# type the following command in the command line interpreter as soon as it appears 
       "  h     "[ENTER]


$ h             #to execute the perlscript 


   ---------------->Executing ShellScript in Command Line Prompt<-------------- 


$ exit        #To exit the current simulation terminal and return to Scilab console

........# (hit [ENTER] for result)

			BACK TO SCILAB CONSOLE...
Loading initial environment 
-->diary(0)