Shell Programming and Scripting

read INPUT
grep "$INPUT" filename || echo "$INPUT not found"

Milkha Singh
Narendra Modi
Barack Obama
Bill clinton
Mohandass K Gandhi

cat script.ksh
echo "Please enter first and last name of user to proceed further, in format of Jim(First_name) cary(Last_name)......."
read name
VALUE=`awk -vNAME="$name" '($0 == NAME){print 1}' Input_file`
if [[ $VALUE == 1 ]]
then
        echo "Put your all next further statements here...."
else
        echo "Name you have entered haven't matched anywhere in the names file list, please enter correct name..."
fi

#### First example when name entered by user exists in Input_file.
./script1.ksh
Please enter first and last name of user to proceed further, in format of Jim(First_name) cary(Last_name).......
Milkha Singh
Put your all next further statements here....
OR
#### Second example where name of user entered by user doesn't exist in Input_file.
./script1.ksh
Please enter first and last name of user to proceed further, in format of Jim(First_name) cary(Last_name).......
Rav Singh
Name you have entered haven't matched anywhere in the names file list, please enter correct name...

status="not found"
echo "Please enter first and last name"
read name
while read line 
do
  if [ "$line" = "$name" ]; then
    status=found
    break
  fi
done < file
echo "$name is $status"