Shell script to convert string lower to upper and upper to lower





 #!/bin/bash

<<doc

Name : Omprakash A Timashetti

Date : 18/08/2022

Description : Shell script to convert string lower to upper and upper to lower


Sample Input :./upper_lower.sh file.txt

              1 – Lower to upper

              2 – Upper to lower

              Please select option : 1

Sample Output:WHAT IS OS?

              WHAT ARE THE DIFFERENT OS?

              WHEN IS OS USED?

              WHAT IS PARTITION AND ITS USE?

              HOW MANY PARTITIONS CAN BE DONE?

Sample Input :./upper_lower.sh file.txt

              1 – Lower to Upper

              2 – Upper to Lower

              Please select option : 2

Sample Output :what is os?

              what are the different os?

              when is os used?

              what is partition and its use?

              how many partitions can be done?

Sample Input:./upper_lower.sh file1.txt

Sample Output:Error: No contents inside the file.

Sample Input:./upper_lower.sh

Sample Output: Error : Please pass the file name through command line.

doc


if [ $# -eq 1 ]                        #Check condition for command line argument

then

if [ -f $1 ]                           #Condition to check wheather file given present or not

then

if [ -s $1 ]                           #Condition to check file contain some content or not

then

echo "1 – Lower to upper"

echo "2 – Upper to lower"

read -p "Please select option:" choice  #Enter choice to lower to upper and upper to lower

case $choice in

    1)

        cat $1 | tr [:lower:] [:upper:]  #Change string to upper case

        ;;

    2)

        cat $1 | tr [:upper:] [:lower:]  #change string to lower case

        ;;

    *)

        echo "Please enter valid choice."

        ;;

esac 

else

    echo "Error: No contents inside the file." #provide message if file has no content

fi

else

    echo "Error: No such $1 file present."  #provide messageif file not present

fi

else           #Error message if command line argument not passed

echo "Error : Please pass the file name through command line." 

fi



Comments

Post a Comment

Popular posts from this blog

Write a script for arithmetic calculator using command line arguments

Image
 #!/bin/bash <<doc Name : Omprakash A Timashetti Date : 12/08/2022 Description : Write a script for arithmetic calculator using command line arguments Sample Input :./arithmatic_calc.sh 25 + 41 Sample Output : 25 + 41 = 66 Sample Input :./arithmatic_calc.sh 10 x 5  Sample Output : 10 x 5 = 50 Sample Input :./arithmatic_calc.sh 25 / 5 Sample Output : 25 / 5 = 5.00 Sample Input :./arithmatic_calc.sh 10.2 - 5.6 Sample Output : 10.2 - 5.6 = 4.6 Sample Input :./arithmatic_calc.sh  Sample Output :Error : Please pass the arguments through command line.                Usage:./arithmatic_calc.sh 2.3 + 6.7 Sample Input :./arithmatic_calc.sh 25 Sample Output : Error:Please pass 3 arguments.                 Usage:./arithmatic_calc.sh 2.3 + 6.7 doc if [ $# -eq 0 ]     #check for the command line arguments                               then      echo "Error : Please pass the arguments through command line."     echo "Usage:./arithmatic_calc.sh 2.3 + 6.7"   elif [ $# -eq 3 ]
Read more

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

Image
 #!/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                                       
Read more

Write a script to print system information using commands

Image
  #!/bin/bash <<doc Name:Omprakash A Timashetti Date:23/08/2022 Description:Write a script to print system information using commands Sample Execution: ./system_info.sh 1. Currently logged users 2. Your shell directory 3. Home directory 4. OS name & version 5. Current working directory 6. Number of users logged in 7. Show all available shells in your system 8. Hard disk information 9. CPU information. 10. Memory Informations 11. File system information. 12. Currently running process. Enter the choice : 2 Your shell directory is /bin/bash doc option=y                            #For first time initialize option to y=yes to get first time menu while [ $option = y ] do echo "1. Currently logged users"     #Dispaly menu echo "2. Your shell directory" echo "3. Home directory" echo "4. OS name & version" echo "5. Current working directory" echo "6. Number of users logged in" echo "7. Show all available shells in y
Read more