Error in awk... Post: 302970114

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Top Forums UNIX for Dummies Questions & Answers Error in awk... Post 302970114 by Don Cragun on Saturday 2nd of April 2016 04:14:49 AM

04-02-2016

Registered User

In the shell, double quote and backslash are regular characters inside a single quoted string. And, although single quote is not a special character inside a double quoted string, the single quote that is causing you problems is terminating a single-quoted string; not a single quote inside a double-quoted string in your awk script. The shell is seeing the single-quoted string:

Code:

'BEGIN \
{
	SAWTOOTHPLUS64 = " !#$&"\'

and both double quotes and single quotes are mismatched after that.

If you want a single quote for use inside a shell single-quoted awk script, define a variable outside the script and use the variable. For example:

Code:

#!/bin/sh
awk -v SQ="'" 'BEGIN \
{
	SAWTOOTHPLUS64 = " !#$&" SQ ")*,-/0235689:<>?ABDEGHJKMNPQSTVWYZ\\^_abdeghjkmnpqstvwyz|}~"
	for(LOOP = 1; LOOP <= 13; ++LOOP)
	{
		SAWTOOTHPLUS64 = SAWTOOTHPLUS64 SAWTOOTHPLUS64
	}
	printf("%s", SAWTOOTHPLUS64) > "/tmp/sawtoothplus64.raw"
}'

Note also that you don't need backslash escapes for the single quote and close parenthesis in the double-quoted string in awkerror1.awk (just as I dropped the backslash escape before the close parenthesis in the above adaptation of awkerror2.awk).

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LEARN ABOUT REDHAT

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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