如何使用awk在输入文件的最后一行之后插入新记录（行或行）？

The marks of the students are given as a table in the following format Name | rollno | marks in exam1 | marks in exam 2 ... i.e. There is one record per line and each column is separated by a | (pipe) character.At the end of all the records I want to add extra lines which contains information about max, min mean...So my question is How would one add new record at the end of input file?The marks of the students are given as a table