I am not familiar with Unix. I am creating a text file through the my Java code. Now my client want me to add ^M character at end of file so he will identify end of file in Unix env. How to add ^M in file is it any escape seq char . does he mean to add "\r\n" at the end ?
The normal UNIX/Linux/Max OSX line separator in just "\n". It's Windows that uses "\r\n", so your client might not have that right. Also, it's a line separator, not a file ender. There's no file ending character in UNIX. DOS used to use ^Z, but I haven't seen that in a long time.