Want to know the Option

[caradoc]

I want to add new contents to the end of an existing file.For doing this what is the operator or command I can use in Linux Operating System

[Rahulbatra]

If you want another file say exforsys that needs to be added to the test file, use cat with the append (>>) operator in the following way:
cat exforsys >> test

Using >> ensures any prior content of test is preserved. The content of exforsys is appended to test.