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Full Discussion: File Duplication Script?
Top Forums Shell Programming and Scripting File Duplication Script? Post 302323163 by Corona688 on Friday 5th of June 2009 03:01:13 PM
Old 06-05-2009
Quote:
Originally Posted by mglenney
Because most of the time I can figure out how to do something I just don't necessarily know the best way to do it. I know it could also be done like this:

while read i; do cp 1.jpg $i; done < filenames

But I don't know if that's any better.
It is far better. Redirection done that way does not require the shell to launch a new process, which is a huge benefit. Also, should filenames happen to be a formidable size, the version using backticks would try to cram the whole thing into one string and cut off most of it, where the loop version can gracefully deal with any list of arbitrary size by reading names one at a time.

And yes, the former does matter even in this day and age. Computers are faster than they used to be, but processes are also bigger and more elaborate than they used to be; launching a new process remains one of the most computationally expensive operations there is, where simple redirection costs nearly nothing next to it.
 

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LEARN ABOUT CENTOS

jpegicc

JPEGICC(1)                                                    General Commands Manual                                                   JPEGICC(1)

NAME

       jpegicc - little cms ICC profile applier for JPEG.

SYNOPSIS

       jpegicc [options] input.jpg output.jpg

DESCRIPTION

       lcms is a standalone CMM engine, which deals with the color management.  It implements a fast transformation between ICC profiles.  jpegicc
       is little cms ICC profile applier for JPEG.

OPTIONS

       -b     Black point compensation.

       -c <0,1,2,3>
              Precalculates transform. (0=Off, 1=Normal, 2=Hi-res, 3=LoRes) [defaults to 1]

       -g     Marks out-of-gamut colors on softproof.

       -h <0,1,2>
              Show summary of options and examples.

       -i profile
              Input profile (defaults to sRGB).

       -m <0,1,2,3>
              SoftProof intent.

       -n     Ignore embedded profile.

       -p profile
              Soft proof profile

       -o profile

       Output profile (defaults to sRGB).

       -q <0..100>
              Output JPEG quality.

       -t <0,1,2,3>
              Intent (0=Perceptual, 1=Colorimetric, 2=Saturation, 3=Absolute).

       -v     Verbose.

EXAMPLES

       To color correct from scanner to sRGB:
            jpegicc -iscanner.icm in.jpg out.jpg

       To convert from monitor1 to monitor2:
            jpegicc -imon1.icm -omon2.icm in.jpg out.jpg

       To make a CMYK separation:
            jpegicc -oprinter.icm inrgb.jpg outcmyk.jpg

       To recover sRGB from a CMYK separation:
            jpegicc -iprinter.icm incmyk.jpg outrgb.jpg

       To convert from CIELab ITU/Fax JPEG to sRGB
            jpegicc -iitufax.icm in.jpg out.jpg

NOTES

       For suggestions, comments, bug reports etc. send mail to info@littlecms.com.

SEE ALSO

       tifficc(1), tiffdiff(1), icc2ps(1), icclink(1), icctrans(1), wtpt(1)

AUTHOR

       This manual page was written by Shiju p. Nair <shiju.p@gmail.com>, for the Debian project.

                                                                September 30, 2004                                                      JPEGICC(1)
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