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Full Discussion: Output Multiple Files in the For Loop
Top Forums Shell Programming and Scripting Output Multiple Files in the For Loop Post 302973460 by bakunin on Wednesday 18th of May 2016 03:03:43 AM
Old 05-18-2016
Quote:
Originally Posted by alvinoo
Does it work? No.. It keeps looping all the time without stopping.
Code:
          if ! read chIP ; then
               print -u2 "no more IPs to read, exiting"
          fi

Yes: first of all, this is why i called it a SKETCH, rather than a SOLUTION in first place. And, comparing the original with your version, what you did was to remove the line break, (see the quoted part above) which is exactly the reason why it doesn't stop looping: you took the stop out!

Another thing: one of the reasons you only get - very generalised - sketches (instead of more specific solutions) here is that you didn't tell us anything about your requirements: OS, used version, used shell, .... But then again, maybe i shouldn't explain that but instead just answer
Quote:
your problem description does not work
and be done with this thread.

bakunin
 

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LEARN ABOUT DEBIAN

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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