How to view a log file which is appended with data simultaneously while it is being read, in unix ?

Use the following Unix command

tail -f "filename"

For example to view Tomcat Catalina logs

server@/home/server/tomcat] tail -f logs/catalina.out
Oct 8, 2010 9:14:27 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory docs
Oct 8, 2010 9:14:27 AM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Oct 8, 2010 9:14:27 AM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Oct 8, 2010 9:14:27 AM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=1/18 config=null
Oct 8, 2010 9:14:27 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 22473 ms

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