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POBreaking out of "tail -f" that's being read by a "while read" loop in HP-UX
 

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  1. POBreaking out of "tail -f" that's being read by a "while read" loop in HP-UX
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    <p>I'm trying to write a (sh -bourne shell) script that processes lines as they are written to a file. I'm attempting to do this by feeding the output of <code>tail -f</code> into a <code>while read</code> loop. This tactic seems to be proper based on my research in Google as well as <a href="https://stackoverflow.com/questions/157163/how-to-do-something-with-bash-when-a-text-line-appear-to-a-file">this question</a> dealing with a similar issue, but using bash.</p> <p>From what I've read, it seems that I should be able to break out of the loop when the file being followed ceases to exist. It doesn't. In fact, it seems the only way I can break out of this is to kill the process in another session. <code>tail</code> does seem to be working fine otherwise as testing with this:</p> <pre> touch file tail -f file | while read line do echo $line done </pre> <p>Data I append to <code>file</code> in another session appears just file from the loop processing written above.</p> <p>This is on HP-UX version B.11.23.</p> <p>Thanks for any help/insight you can provide!</p>
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