Count the number of users with user IDs between given range.





 #!/bin/bash

<<doc

Name : Omprakash A Timashetti

Date : 21/08/2022

Description :Count the number of users with user IDs between given range.


Sample Input1: ./user_ids.sh

Sample Ouput1:Total count of user ID between 500 to 10000 is: 2


Sample Input2: ./user_ids.sh 0 100

Sample Output2:Total count of user ID between 0 to 100 is : 3


Sample Input3:./user_ids.sh 100

Sample Output3:Error : Please pass 2 arguments through CL.

               Usage : ./user_ids.sh 100 200


Sample Input4:./user_ids.sh 200 100

Sample Output4:Error : Invalid range. Please enter the valid range through CL.

doc


#Count the number of of users  with user id between given range. 


Array=($(cut -d ":" -f3 /etc/passwd))                                #Store userId in Array

count=0                                                              #Initialize count=0

if [ $# -eq 0 ]                                                      #If no Command line argument is passed

then                                                              

    for i in ${Array[@]}                                             #For loop to get each userid

    do                                                             

    if [ $i -gt 500 -a $i -lt 10000 ]                              #By defualt if no CLA passed it should check how many userId are there 

    then

        count=$(($count+1))                                          #Increament the count

        fi

    done

    echo "Total count of user ID between 500 to 10000 is:$count"     #Print the count


elif [ $# -eq 2 ]                                                    #Check the if CLA passed are equal 2

then

if [ $1 -lt $2 ]                                                     #condition to check first cla greater than Second

then

    for i in ${Array[@]}

    do

    if [ $i -gt $1 -a $i -lt $2 ]                                    #Check the number of id in between given range 

    then

        count=$(($count+1))                                          #get the number how many present in between given range

    fi

    done

    

    echo "Total count of user ID between $1 to $2 is:$count"         #Print the count

else

  echo "Error:Invalid range .Please enter the valid range through CL." #if first argument greater than second .print error message

fi

else

    echo "Error:Please pass 2 arguments throgh CL."         #if command line arguments are not equal to 0 and 2.print the error message

    echo "Usage:./user_ids.sh 100 200"

fi


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