Grep: Case Sensitive (-i)

 #! bin/bash
# Script for case sensitive

[prabhucloudxlab@cxln4 ~]$ cat>hello.sh
echo " enter filename is search text from "
read filename

if [[ -f $filename ]]
then
echo "enter the text1 to search"
read grepvar1
grep $grepvar1 $filename

echo "enter the text2 to search"
read grepvar2
grep -i $grepvar2 $filename
else
echo "$filename does not exist"
fi

[prabhucloudxlab@cxln4 ~]$ sh hello.sh
 enter filename is search text from
filegrep.txt

enter the text1 to search
linux
This is linux
This is linux
This is linux
This is linux
This is linux
This is linux
This is linux
This is linux

enter the text2 to search
Linux
This is linux
This is linux
This is linux
This is linux
This is linux
This is linux
This is linux
This is linux