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#!/usr/bin/perl
open (HTML, "-|") or exec("tail","-f","testlog.txt");
print while <HTML>;

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[gmassyn@apt01m04 gmassyn]$ ps -ef |grep test
gmassyn   7755  7712  0 21:57 pts/0    00:00:00 /usr/bin/perl ./testb.
+pl
...
gmassyn   7756     1  0 21:57 pts/0    00:00:00 tail -f testlog.txt
gmassyn   7764  7712  0 21:57 pts/0    00:00:00 grep test
[gmassyn@apt01m04 gmassyn]$