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Top Forums UNIX for Dummies Questions & Answers How to extract a portion of text from a log file Post 302280576 by atilano on Tuesday 27th of January 2009 09:25:43 AM
Old 01-27-2009
Quote:
Originally Posted by zaxxon
Can try this one:
Code:
sed '/^===\+ Carbon .*===\+$/,/^=\+[[:space:]]*$/!d' infile

You have a blank at the end of the last separator line so I included that [[:space:]]* to make sure it get's it.
Thanks for your help!

I want to make sure I understand what is going on: sed will send to STDOUT the block of text beginning with "==== Carbon" and ending with "===== " (and everything in between from the input file /Library/Logs/CCC.log.

What I don't understand is how sed knows to start at the end of CCC.log (where the latest log entry would be) and how sed knows it is supposed to send one log entry and not every log entry. I have a feeling it has something to do with !d at the end of the command but could not find anything in the man page.

Thanks again for your help.

Code:
#! /bin/bash 
sed '/^===\+ Carbon .*===\+$/,/^=\+[[:space:]]*$/!d' /Library/Logs/CCC.log | mail -s "CCC Log" "myemailaddress"

 

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tracker-extract(1)						   User Commands						tracker-extract(1)

NAME
tracker-extract - Extract metadata from a file. SYNOPSYS
tracker-extract [OPTION...] FILE... DESCRIPTION
tracker-extract reads the file and mimetype provided in stdin and extract the metadata from this file; then it displays the metadata on the standard output. NOTE: If a FILE is not provided then tracker-extract will run for 30 seconds waiting for DBus calls before quitting. OPTIONS
-?, --help Show summary of options. -v, --verbosity=N Set verbosity to N. This overrides the config value. Values include 0=errors, 1=minimal, 2=detailed and 3=debug. -f, --file=FILE The FILE to extract metadata from. The FILE argument can be either a local path or a URI. It also does not have to be an absolute path. -m, --mime=MIME The MIME type to use for the file. If one is not provided, it will be guessed automatically. -d, --disable-shutdown Disable shutting down after 30 seconds of inactivity. -i, --force-internal-extractors Use this option to force internal extractors over 3rd parties like libstreamanalyzer. -m, --force-module=MODULE Force a particular module to be used. This is here as a convenience for developers wanting to test their MODULE file. Only the MOD- ULE name has to be specified, not the full path. Typically, a MODULE is installed to /usr/lib/tracker-0.7/extract-modules/. This option can be used with or without the .so part of the name too, for example, you can use --force-module=foo Modules are shared objects which are dynamically loaded at run time. These files must have the .so suffix to be loaded and must con- tain the correct symbols to be authenticated by tracker-extract. For more information see the libtracker-extract reference documen- tation. -V, --version Show binary version. EXAMPLES
Using command line to extract metadata from a file: $ tracker-extract -v 3 -f /path/to/some/file.mp3 Using a specific module to extract metadata from a file: $ tracker-extract -v 3 -f /path/to/some/file.mp3 -m mymodule ENVIRONMENT
TRACKER_EXTRACTORS_DIR This is the directory which tracker uses to load the shared libraries from (used for extracting metadata for specific file types). These are needed on each invocation of tracker-store. If unset it will default to the correct place. This is used mainly for testing purposes. FILES
$HOME/.config/tracker/tracker-extract.cfg SEE ALSO
tracker-store(1), tracker-sparql(1), tracker-stats(1), tracker-info(1). tracker-extract.cfg(5). /usr/lib/tracker-0.7/extract-modules/ GNU
July 2007 tracker-extract(1)
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