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Full Discussion: Super Simple Script to remove first characters of any png file
Special Forums Windows & DOS: Issues & Discussions Super Simple Script to remove first characters of any png file Post 302775391 by Corona688 on Monday 4th of March 2013 05:46:38 PM
Old 03-04-2013
Strip the first 2 bytes from every png file, do you mean?

If you can use busybox win32, I'd try this in a busybox shell:

Code:
for FILE in *.png ; do ( dd bs=2 count=1 > JUNK ; cat ) < $FILE > new-$FILE ; echo mv new-$FILE $FILE ; done
rm -f JUNK

Remove the echo from that once you've tested it and are sure it does what you want.

And it'd make much more sense to look at if you didn't insist on jamming it into 2 lines.
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LEARN ABOUT SUNOS

png

png.4(4)							   File Formats 							  png.4(4)

NAME

       png - Portable Network Graphics (PNG) format

DESCRIPTION

       PNG (Portable Network Graphics) is an extensible file format for the lossless, portable, well-compressed storage of raster images. PNG pro-
       vides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-color, grayscale, and truecolor  images  are
       supported, and an optional alpha channel. Sample depths range from 1 to 16 bits.

       PNG is designed to work well in online viewing applications, such as the World Wide Web, and is fully streamable with a progressive display
       option.	PNG is robust, and provides both full file integrity checking, and fast simple detection of common transmission  errors.  PNG  can
       store gamma and chromaticity data for improved color matching on heterogeneous platforms.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWpng			   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |External			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       libpng(3), zlib(3)

       PNG 1.2 specification, July 1999: http://www.libpng.org/pub/png or ftp://ftp.uu.net/graphics/png/documents

       PNG 1.0 specification, October 1996: RFC 2083 ftp://ds.internic.net/rfc/rfc2083.txt or as a W3C Recommendation at http://www.w3.org/TR/REC-
       png.html

NOTES

       This man page was originally written by Glenn Randers-Pehrson. Updated by Breda McColgan, Sun Microsystems Inc., 2004.

SunOS 5.10							    26 Mar 2004 							  png.4(4)
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