tail –  output the last part of files -allows view last 10 lines of a file

tail [OPTION]… [FILE]… 

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.

Mandatory arguments to long options are mandatory for short options too.

keep trying to open a file even if it is inaccessible when tail starts or if it becomes inaccessible later  useful only with -f
output the last N bytes
output appended data as the file grows; -f–follow, and –follow=descriptor are equivalent
same as –follow=name –retry
output the last N lines, instead of the last 10
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 -f, terminate after process ID, PID dies
never output headers giving file names
with -f, sleep for approximately S seconds (default 1.0) between iterations.
always output headers giving file names
display this help and exit
output version information and exit