tail(1) - output the last part of files
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.
-c, --bytes=K
       output the last K bytes; alternatively, use -c +K to output bytes starting with the  Kth  of  each
-f, --follow[={name|descriptor}]
       output appended data as the file grows; -f, --follow, and --follow=descriptor are equivalent
-F     same as --follow=name --retry
-n, --lines=K
       output  the  last  K lines, instead of the last 10; or use -n +K to output lines starting with the
       with --follow=name, reopen a FILE which has not changed size after N (default 5) iterations to see
       if  it  has been unlinked or renamed (this is the usual case of rotated log files).  With inotify,
       this option is rarely useful.
       with -f, terminate after process ID, PID dies
-q, --quiet, --silent
       never output headers giving file names
       keep trying to open a file even when it is or becomes inaccessible; useful when following by name,
       i.e., with --follow=name
-s, --sleep-interval=N
       with  -f,  sleep  for  approximately N seconds (default 1.0) between iterations.  With inotify and
       --pid=P, check process P at least once every N seconds.
-v, --verbose
       always output headers giving file names
--help display this help and exit
       output version information and exit

If the first character of K (the number of bytes or lines) is a `+', print beginning with  the  Kth  item
from  the  start  of  each  file, otherwise, print the last K items in the file.  K may have a multiplier
suffix: b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024, GB 1000*1000*1000, G 1024*1024*1024, and so on
for T, P, E, Z, Y.