Re: why the long delays?

You made sure your output isn't buffered ($|=1;), so that means the it must be one of the other programs that is buffering its output. ssh, tail and/or grep realize they are connected to a pipe and buffer their output as a result. You'll need to convince the offender(s) that they are connected to a terminal via some command line option or by using a pseudo tty (ptty).

For my versions of tail, grep and ssh, I found that

tail -f doesn't buffer its output.
grep buffers its output unless it's output is connected to a terminal or --line-buffered is provided.
ssh doesn't buffer its output.

Adding --line-buffered to grep should do the trick.

Update: Added "For my version" on.

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Re^2: why the long delays? by alager (Acolyte) on Apr 15, 2010 at 18:26 UTC
Adding --line-buffered to grep DID do the trick. Thanks for the help. The reason I stuck with the shell grep instead of the perl grep was the ease of highlight on match. Aaron	[reply]