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Full Discussion: Incremental log parser
Top Forums Shell Programming and Scripting Incremental log parser Post 302290137 by cfajohnson on Sunday 22nd of February 2009 02:03:59 AM
Old 02-22-2009
Quote:
Originally Posted by Narcom
I want to read directly from middle of the file. For example if file 1000 byte. I want to read directly from 100 byte to 999 byte.

To read bytes from a file:

Code:
## Command-line info:
file=$1
firstbyte=$2
lastbyte=$3

## Calculate bytes to skip and no. of bytes wanted
skip=$(( $firstbyte - 1 ))
count=$(( $lastbyte - $firstbyte + 1 ))

## Do it!
dd bs=1 skip=$skip count=$count < "$file" 2>/dev/null

To read lines from a file:

Code:
sed -n "$firstline,$lastline p" "$file"

 

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ovs-parse-leaks(8)						Open vSwitch Manual						ovs-parse-leaks(8)

NAME
ovs-parse-leaks - parses OVS leak checker log files SYNOPSIS
ovs-parse-leaks [binary] < log DESCRIPTION
Many Open vSwitch daemons accept a --check-leaks option that writes information about memory allocation and deallocation to a log file. ovs-parse-leaks parses log files produced by this option and prints a summary of the results. The most interesting part of the output is a list of memory blocks that were allocated but not freed, which Open vSwitch developers can use to find and fix memory leaks. The log file must be supplied on standard input. The binary that produced the output should be supplied as the sole non-option argument. For best results, the binary should have debug symbols. OPTIONS
--help Prints a usage message and exits. BUGS
The output can be hard to interpret, especially for a daemon that does not exit in normal operation. Using ovs-appctl(8) to invoke the exit command that some Open vSwitch daemons support sometimes helps with this. ovs-parse-leaks usually incorrectly reports one or more ``bad frees of not-allocated address'' errors at the beginning of output. These reflect frees of data that were allocated before the leak checker was turned on during program initialization. Open vSwitch August 2010 ovs-parse-leaks(8)
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