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Top Forums UNIX for Dummies Questions & Answers comparing Huge Files - Performance is very bad Post 302092551 by BOFH on Tuesday 10th of October 2006 03:10:50 PM
Old 10-10-2006
I've noticed that for simple things, I can shell script something and it works fine. When things start getting complicated or there's a performance issue, I'll break out perl (or python if you like).

I'd take what you have and see if it could be done better in perl. I'm sure it'd be a lot faster and probably easier to write.

Carl
 

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tiffcmp(1)							   User Commands							tiffcmp(1)

NAME
tiffcmp - compare two TIFF files SYNOPSIS
tiffcmp [options] file1.tif file2.tif DESCRIPTION
tiffcmp compares the tags and data in two files created according to the Tagged Image File Format, Revision 6.0. The schemes used for com- pressing data in each file are immaterial when comparing data. Files are compared on a scanline-by-scanline basis after decompression. Most directory tags are checked, notable exceptions are GrayResponseCurve, ColorResponseCurve, and ColorMap tags. Data is not compared if any of the BitsPerSample, SamplesPerPixel, or ImageWidth values are not equal. By default, tiffcmp terminates if any difference is encountered. OPTIONS
The following options are supported: -l List each byte of image data that differs between the files. -t Ignore any differences in directory tags. OPERANDS
The following operands are supported: filex.tif The names of the TIFF files to be compared. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWTiff | +-----------------------------+-----------------------------+ |Interface stability |External | +-----------------------------+-----------------------------+ SEE ALSO
pal2rgb(1), tiffinfo(1), tiffcp(1), tiffmedian(1), libtiff(3) NOTES
Tags that are not recognized by the library are not compared. Such tags may also generate spurious diagnostics. Updated by Breda McColgan, Sun Microsystems Inc., 2004. SunOS 5.10 26 Mar 2004 tiffcmp(1)
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