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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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kclog(1M)																 kclog(1M)

NAME
kclog - manage kernel configuration log file SYNOPSIS
config] string] type] name] [count] comment DESCRIPTION
is the administrative command for the HP-UX kernel configuration log file. The log file is automatically maintained by all of the kernel configuration commands (and Any change to any kernel configuration gets logged to this log file, which is located at Note that this file is a plain text file which can be viewed and manipulated using standard Unix file management commands; exists simply for convenience in find- ing particular log file entries. Under normal usage, prints the last count entries in the log file. When one of the options is specified, prints the last count entries that match the specified criteria. If count is not specified, it defaults to 1. Options will print all entries matching criteria. If this option is not specified, will only print the last count entries that match the specified criteria. will print only log file entries describing changes to the saved kernel configuration named config. If this option is not specified, will print log file entries describing changes to any saved or running kernel configuration. will not print any entries. Instead, will create a new entry, as if a kernel configuration change had been made, containing the specified comment. This option is only allowed for users with appropriate privileges. will print only log file entries that contain the given string. will print only log file entries that refer to a configuration object (module or tunable) of the given name. will print only log file entries that refer to configuration objects of the specified type: or RETURN VALUE
returns zero for success. It returns non-zero and prints a diagnostic message if an error occurs. EXAMPLES
To see the last three entries in the log: To see the last entry for the tunable To see the last five entries for module changes: To see all entries for module changes: To see the last entry mentioning Aberdeen: WARNINGS
The format of the log file may be changed without notice. Some configuration changes can be made without using the kernel configuration commands. No log file entries are made for such changes. The log file should not be manually edited. Doing so may cause to behave unpredictably. SEE ALSO
kcmodule(1M), kconfig(1M), kctune(1M), kconfig(5). available on kclog(1M)
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