tail(1) -n10 mylog.log
output the last part of files
-n, --lines=K
       output  the  last  K lines, instead of the last 10; or use -n +K to output lines starting with the
Print  the  last  10 lines of each FILE to standard output.  With more than one FILE, precede each with a
header giving the file name.  With no FILE, or when FILE is -, read standard input.
source manpages: tail