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POHow do I find broken NMEA log sentences with grep?
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copied!<p>My GPS logger occassionally leaves "unfinished" lines at the end of the log files. I think they're only at the end, but I want to check all lines just in case. </p> <p>A sample complete sentence looks like:</p> <pre><code>$GPRMC,005727.000,A,3751.9418,S,14502.2569,E,0.00,339.17,210808,,,A*76 </code></pre> <p>The line should start with a <code>$</code> sign, and end with an <code>*</code> and a two character hex checksum. I don't care if the checksum is correct, just that it's present. It also needs to ignore "ADVER" sentences which don't have the checksum and are at the start of every file.</p> <p>The following Python code might work: </p> <pre><code>import re from path import path nmea = re.compile("^\$.+\*[0-9A-F]{2}$") for log in path("gpslogs").files("*.log"): for line in log.lines(): if not nmea.match(line) and not "ADVER" in line: print "%s\n\t%s\n" % (log, line) </code></pre> <p>Is there a way to do that with <code>grep</code> or <code>awk</code> or something simple? I haven't really figured out how to get <code>grep</code> to do what I want.</p> <p><strong>Update</strong>: Thanks @Motti and @Paul, I was able to get the following to do almost what I wanted, but had to use single quotes and remove the trailing <code>$</code> before it would work:</p> <pre><code>grep -nvE '^\$.*\*[0-9A-F]{2}' *.log | grep -v ADVER | grep -v ADPMB </code></pre> <p>Two further questions arise, how can I make it ignore blank lines? And can I combine the last two <code>grep</code>s?</p>

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