Write a script to replace 20% lines in a C file randomly and replace it with the pattern





 <<doc

Name:Omprakash A Timashetti 

Date:24/08/2022

Description:Write a script to replace 20% lines in a C file randomly and replace it with the pattern

Sample Execution:


1. ./replace_DEL.sh main.c

Before replacing

#incude <stdio.h>

int main()

{

         printf(“Hello world\n”);

}

After replacing

#incude <stdio.h>

int main()

{

<-----------Deleted------------>

}

2. ./replace_DEL.sh main1.c

Error : No such a file.

3. ./replace_DEL.sh main2.c

Error : main2.c is empty file. So can’t replace the string.

4. ./replace_DEL.sh

Error : Please pass the file name through command line.


doc


#!/bin/bash

if [ $# -ne 0 ]                                               #check for command line argument passed or not

then

    if [ -f $1 ]                                              #check for file present or not

    then

        if [ -s $1 ]                                          #Check for content of file  

        then

            echo "Before replacing"                           #Content of file before replacing

            cat $1

            totallines=(`wc -l < $1`)                         #Line contains in file                 

            if [ $totallines -gt 5 ]                          #if file contains greater than 5 

            then

                replace=$(($totallines/5))                    #Number of lines to be replace

               for i in `seq 1 $replace`

                do

                 randomNumbers=`shuf -i 1-$totallines -n1 `   #Get random number for replace

                 sed -i "$randomNumbers s/.*/<-------Deleted-------->/" $1    #replace file content

               done

               echo "After replacement"

               cat $1

        else

            echo  "File contains less than 5 line"               #Print error if file contains less than 5 line

        fi

        else

            echo "Error : main2.c is empty file. So can’t replace the string." #Print message if file not contains any thing

        fi

    else

        echo "Error : No such a file".                            #If file not present

    fi

else

    echo "Error : Please pass the file name through command line."  #print message if command line not passed


fi


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