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extract a line from a file using the line number

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Old 01-22-2009
Head tail combo is best for large volumes
I had two files with 1.28e+06 * 2 bits of info; I wanted to plot every 256 lines for each file. I am using gnuplot.

From my experience the slowest was to use the 'every' command for gnuplot, as it would load the entire file in to memory seemingly for each tiny plot. Using sed to extract a specific line was just as slow; I found this to be because after you have extracted the part you need, the rest of the file is read for good measure.

Using the head, tail combo (which I thought I would like to avoid) is orders of magnitude faster, however, it gets slightly slower (still fastest I have tried) as you progress through the file.
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LEARN ABOUT DEBIAN

innoextract

innoextract(1)						      General Commands Manual						    innoextract(1)

NAME

       innoextract - tool to extract installers created by Inno Setup

SYNOPSIS

       innoextract [-behlLqstv] [-ccolor] [-pprogress] installers ...

DESCRIPTION

       innoextract is a tool that can extract installer executables created by Inno Setup.

       innoextract will extract files from a installers specified on the command line.

       To  extract  a  multi-part  installer with external data files, only the executable (.exe) file needs to be given as an argument to innoex-
       tract.

OPTIONS

       -c --color [enable]
	      By default innoextract will try to detect if the terminal supports shell escape codes and enable or  disable  color  output  accord-
	      ingly. Pass 1 or true to --color to force color output. Pass 0 or false to never output color codes.

       --dump Don't convert Windows paths to UNIX paths and don't substitute variables in paths.

       -e --extract
	      Extract all files to the current directory. This is the default action. You may only specify one of --extract , --list and --test

       -h --help
	      Show a list of the supported options.

       --language [lang]
	      Extract only language-independent files and files for the given language. By default all files are extracted.

       --license
	      Show license information.

       -l --list
	      List files contained in the installer but don't extract anything. You may only specify one of --extract , --list and --test

       -L --lowercase
	      Convert filenames stored in the installer to lower-case before extracting.

       -p --progress [enable]
	      By  default  innoextract	will  try  to detect if the terminal supports shell escape codes and enable or disable progress bar output
	      accordingly. Pass 1 or true to --progress to force progress bar output. Pass 0 or false to never show a progress bar.

       -q --quiet
	      Less verbose output.

       -s --silent
	      Don't output anything except errors and warnings.

       -t --test
	      Test archive integrity but don't write any output files. You may only specify one of --extract , --list and --test

       -v --version
	      Show the innoextract version number and supported Inno Setup versions.

LIMITATIONS

       innoextract currently only supports extracting all the data. There is no support for extracting individual files, components or languages.

       Included scripts and checks are not executed.

       Data is always extracted to the current directory and the mapping from Inno Setup variables like the application directory  to  subdirecto-
       ries is hard-coded.

       innoextract  does  not check if an installer includes multiple files with the same name and will continually overwrite the destination file
       when extracting.

       Names for data files in multi-file installers must follow the standard naming scheme.

       Encrypted installers are not supported.

SEE ALSO

       cabextract(1), unshield(1)

BUGS

       No known bugs.

AUTHOR

       Daniel Scharrer (daniel@constexpr.org)

1.2								    2012-04-01							    innoextract(1)