Hello

I need to check if following three files exist in a file, how to do that in shell script:
1. ALL MACHING RECORD COLUMNS MATCHED (Baseline and Regression File)
2. Total Mismatched Records (Baseline File): 0
3. Total Mismatched Records (Regression File): 0

Currently I am seaching only for one line "ALL MACHING RECORD COLUMNS MATCHED (Baseline and Regression File)" and doing it like this:

 if [  -s $regfiles_name ]; then
                grep "ALL MACHING RECORD COLUMNS MATCHED (Baseline and Regression File)" $regfiles_name
                retval=$?
                if [ $retval != 0 ]; then
                   echo $regfiles " - There is a mismatch" >> reg_email_body
                else
                   echo $regfiles " - Matched" >> reg_email_body
                fi
fi