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Full Discussion: How to replace all but the first 3 characters with sed?
Top Forums Shell Programming and Scripting How to replace all but the first 3 characters with sed? Post 302935083 by Scrutinizer on Thursday 12th of February 2015 03:11:50 PM
Old 02-12-2015
You should ignore the time it takes the first time, because that is used to read pieces of program and data into memory, which varies a lot, in addition to the time it takes to run the program. The second time, it is already in memory, so the time is largely the time to run the program. That's why it is a lot faster and also more consistent, which makes it a more reliable way to do comparisons relative to other solutions..
 

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LEARN ABOUT DEBIAN

rdiff-backup-statistics

RDIFF-BACKUP(1) 						   User Manuals 						   RDIFF-BACKUP(1)

NAME

       rdiff-backup-statistics - summarize rdiff-backup statistics files

SYNOPSIS

       rdiff-backup-statistics [--begin-time time] [--end-time time] [--minimum-ratio ratio] [--null-separator] [--quiet] repository

DESCRIPTION

       rdiff-backup-statistics	reads the matching statistics files in a backup repository made by rdiff-backup and prints some summary statistics
       to the screen.  It does not alter the repository in any way.

       The required argument is the pathname of the root of an rdiff-backup repository.  For instance, if you ran "rdiff-backup in out", you could
       later run "rdiff-backup-statistics out".

       The  output  has  two  parts.  The first is simply an average of the all matching session_statistics files.  The meaning of these fields is
       explained in the FAQ included in the package, and also at http://rdiff-backup.nongnu.org/FAQ.html#statistics.

       The second section lists some particularly significant files (including directories).  These files are either contain a lot of  data,  take
       up increment space, or contain a lot of changed files.  All the files that are above the minimum ratio (default 5%) will be listed.

       If  a  file  or directory is listed, its contributions are subtracted from its parent.  That is why the percentage listed after a directory
       can be larger than the percentage of its parent.  Without this, the root directory would always be the largest, and  the  output  would	be
       boring.

OPTIONS

       --begin-time time
	      Do  not  read  statistics  files older than time.  By default, all statistics files will be read.  time should be in the same format
	      taken by --restore-as-of.  (See TIME FORMATS in the rdiff-backup man page for details.)

       --end-time time
	      Like --begin-time but exclude statistics files later than time.

       --minimum-ratio ratio
	      Print all directories contributing more than the given ratio to the total.  The default value is .05, or 5 percent.

       --null-separator
	      Specify that the lines of the file_statistics file are separated by nulls ().  The default is to assume  that  newlines  separate.
	      Use this switch if rdiff-backup was run with the --null-separator when making the given repository.

       --quiet
	      Suppress printing of the "Processing statistics from session..."	output lines.

BUGS

       When aggregating multiple statistics files, some directories above (but close to) the minimum ratio may not be displayed.  For this reason,
       you may want to set the minimum-ratio lower than need.

AUTHOR

       Ben Escoto <ben@emerose.org>, based on original script by Dean Gaudet.

SEE ALSO

       rdiff-backup(1), python(1).  The rdiff-backup web page is at http://rdiff-backup.nongnu.org/.

Version 1.2.8							    March 2009							   RDIFF-BACKUP(1)
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