less can do this: less +F /var/log/blah.log then ctrl-c to switch into regular less mode (for scrolling back or searching), and 'F' to go back into follow m

less can do this: less +F /var/log/blah.log then ctrl-c to switch into regular less mode (for scrolling back or searching), and 'F' to go back into follow mode to watch changes roll in. You don't have to start less in follow mode either, 'F' will work regardless.