tail is a program on Unix and Unix-like systems used to display the tail end of a text file or piped data.
# To show the last 10 lines of file
tail file
# To show the last N lines of file
tail -n N file
# To show the last lines of file starting with the Nth
tail -n +N file
# To show the last N bytes of file
tail -c N file
# To show the last 10 lines of file and to wait for file to grow
tail -f file