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Full Discussion: Name changing script
Top Forums Shell Programming and Scripting Name changing script Post 302984536 by Huitzilopochtli on Wednesday 26th of October 2016 10:14:12 PM
Old 10-26-2016
Quote:
Originally Posted by Don Cragun
With a question like this it ALWAYS helps to know what operating system and shell you're using...

Assuming you're using a shell that provides the basic parameter expansions required by the POSIX standards, you could try something like:
Code:
for file in *.jpg
do    mv "$file" "${file%.jpg}.png"
done

Thank you for that, but as a new-ish user, my understanding of your answer is limited. Could you explain to me what exactly is happening right after the do command?? The punctuation is unfamiliar. Learning what it means could help me a lot during the future.

---------- Post updated at 09:14 PM ---------- Previous update was at 09:08 PM ----------

@ Don Cragun

Also, I just tested your script, and it works. Thank you so much for your time. But still, if you could explain to me, or point me to a place where I might learn, what exactly was scripted, it would be a tremendous help to me.
 

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LEARN ABOUT REDHAT

ppmquantall

ppmquantall(1)						      General Commands Manual						    ppmquantall(1)

NAME

       ppmquantall - run ppmquant on a bunch of files all at once, so they share a common colormap

SYNOPSIS

       ppmquantall [-ext extension] ncolors ppmfile ...

DESCRIPTION

       Takes a bunch of portable pixmap as input.  Chooses ncolors colors to best represent all of the images, maps the existing colors to the new
       ones, and overwrites the input files with the new quantized versions.

       If you don't want to overwrite your input files, use the -ext option.  The output files are then named the same as the input files, plus  a
       period and the extension text you specify.

       Verbose	explanation:  Let's  say  you've got a dozen pixmaps that you want to display on the screen all at the same time.  Your screen can
       only display 256 different colors, but the pixmaps have a total of a thousand or so different colors.  For a single pixmap you  solve  this
       problem	with  ppmquant;  this  script  solves  it for multiple pixmaps.  All it does is concatenate them together into one big pixmap, run
       ppmquant on that, and then split it up into little pixmaps again.

       (Note that another way to solve this problem is to pre-select a set of colors and then use ppmquant's -map option  to  separately  quantize
       each pixmap to that set.)

SEE ALSO

       ppmquant(1), ppm(5)

BUGS

       It's a csh script.  Csh scripts are not portable to System V.  Scripts in general are not portable to non-Unix environments.

AUTHOR

       Copyright (C) 1991 by Jef Poskanzer.

								   27 July 1990 						    ppmquantall(1)
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