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Full Discussion: Filter ONLY lines with non-printing charaters
Top Forums Shell Programming and Scripting Filter ONLY lines with non-printing charaters Post 302987255 by bakunin on Wednesday 7th of December 2016 03:15:36 PM
Old 12-07-2016
To add a different take: if you mean by "non-printable" characters those which cannot be displayed because of your locale (like, for instance, UTF-8-characters with a "C"-locale) you can use seds l-command (display characters in a visually unambiguous form) to display these.

For instance, the following file content (german umlauts):

Code:
xx Ä xx
xx ö xx

would be displayed as:

Code:
# sed -n 'l' umlaut.file
xx \303\204 xx$
xx \303\266 xx$

Note, that this is NOT a translation, so you cannot do further work on the pattern space and transform the resulting 3-digit (octal) codes. Save the resulting file instead and then start a new sed (grep, ...) -command to further process it, i.e. to select all the lines with umlauts:

Code:
# sed -n 'l' umlaut.file > result
# grep '\\[0-7][0-7][0-7]' result

I hope this helps.

bakunin
Last edited by bakunin; 12-07-2016 at 07:40 PM..
This User Gave Thanks to bakunin For This Post:
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LEARN ABOUT LINUX

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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