How to view file contents in linux

tail is to display the last lines of the content of a file; the

usage is relatively simple;
tail -n is the numerical file name of the line; for

example, if we display the last 5 lines of /etc/profile, it should be:
[root@localhost ~]# tail -n 5 /etc/profile

tail -f /var/log/syslog Display the last ten lines of the syslog file and automatically display the new file content after the file content is added.