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Full Discussion: How to make awk command faster for large amount of data?
Top Forums Shell Programming and Scripting How to make awk command faster for large amount of data? Post 303024264 by Don Cragun on Thursday 4th of October 2018 09:11:43 PM
Old 10-04-2018
Quote:
Originally Posted by disedorgue
Hi, here a perl script that output first and last line, maybe most faster but i'm not sure...

... ... ...

Regards.
It might, or might not, be faster depending on what hardware you're using, what operating system you're using, what version of perl you're using, and what other tools you're using as a comparison. But, note that even though this is only printing the first and last lines of the compressed file, it can't avoid reading the entire compressed file and uncompressing all of the compressed data to be able to determine the contents of the last line in the file. (Decompression can't start at random places in the file; it must start at the beginning and progress byte by byte from there.)
This User Gave Thanks to Don Cragun For This Post:
disedorgue
 

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LEARN ABOUT DEBIAN

image::exiftool::writepng

Image::ExifTool::WritePNG(3pm)				User Contributed Perl Documentation			    Image::ExifTool::WritePNG(3pm)

NAME

       Image::ExifTool::WritePNG.pl - Write PNG meta information

SYNOPSIS

       These routines are autoloaded by Image::ExifTool::PNG.

DESCRIPTION

       This file contains routines to write PNG metadata.

NOTES

       Compress::Zlib is required to write compressed text.

       Existing text tags are always rewritten in their original form (compressed zTXt, uncompressed tEXt or internation iTXt), so pre-existing
       compressed information can only be modified if Compress::Zlib is available.

       Newly created textual information is written in uncompressed tEXt form by default, or as compressed zTXt if the Compress option is used and
       Compress::Zlib is available (but only if the resulting compressed data is smaller than the original text, which isn't always the case for
       short text strings).

AUTHOR

       Copyright 2003-2011, Phil Harvey (phil at owl.phy.queensu.ca)

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       Image::ExifTool::PNG(3pm), Image::ExifTool(3pm)

perl v5.12.4							    2011-01-03					    Image::ExifTool::WritePNG(3pm)
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