Display the last part of a file.

# To show last 'num' lines in file:
tail -n <num> <file>

# To show all file since line 'num':
tail -n +<num> <file>

# To show last 'num' bytes in file:
tail -c <num> <file>

# To keep reading file until 'Ctrl + C':
tail -f <file>

# To keep reading file until 'Ctrl + C', even if the file is rotated:
tail -F <file>