UNIX for Beginners Questions & Answers

find /home/bharat/ -type f -name "apache_logs.txt" |while read file
  do
    RESULT=$(egrep "400|401|403|404|405" $file)
      if [[ ! -z $RESULT ]]
         then
            echo "Error(s) in $file on $HOSTNAME at "$(date)": $RESULT">> email_result.txt 
     fi
  done

       -F, --fixed-strings
              Interpret PATTERN as a list of fixed strings (instead of regular
              expressions), separated by newlines,  any  of  which  is  to  be
              matched.

if egrep "[^0](400|401|403|404|405)" file; then echo errors; fi

egrep "\<(400|401|403|404|405)\>" $file

grep -w '40[01345]' file

grep -w -e 400 -e 401 -e 403 -e 404 -e 405 file

grep -w '400
401
403
404
405' file