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Full Discussion: Removing a character
Top Forums UNIX for Dummies Questions & Answers Removing a character Post 302521029 by ctsgnb on Tuesday 10th of May 2011 03:57:17 AM
Old 05-10-2011
The right way to write it is :

Code:
sed 's/[][]//g' infile

1. The red ones enclosed all the elements that are concerned (that are to be replaced)
2. the closing bracket ] is a special case and should be declared at FIRST in the element list (Just for your info , another special case in the hyphen , the hyphen when within square bracket definition, should be first OR last to be taken as litteral, otherwise it is taken for range definition)

Code:
$ echo '[]]]]]][[[[[[]]]]]]]][[[[1[[[]]2]]][[[]]1]]]][[[' | sed 's/[][]//g'
121

Last edited by ctsgnb; 05-10-2011 at 05:57 AM..
This User Gave Thanks to ctsgnb For This Post:
rob171171
 

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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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