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+pw (view data passing through a pipe)
+
+pw stands for Pipe Watch, a utility that continuously reads lines
+of text from a pipe or pipe-like source, passes them through a FIFO
+buffer, and maintains a display based on occasionally sampling the
+contents of the FIFO buffer, with useful features such as triggering
+and filtering.
+
+pw can monitor anything that produces textual output. tail -f
+/var/logfile, tcpdump, strace, ...