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Full Discussion: Vi editor questions
Homework and Emergencies Homework & Coursework Questions Vi editor questions Post 302787617 by ravisingh on Saturday 30th of March 2013 12:34:05 AM
Old 03-30-2013
Vi editor questions
Code:
1. How do you do the following? 
a) invert the case of all characters in the correct line
b) convert to uppercase the entire line

2. How can you number all the lines which are a) saved, b) not saved, when saving the line?[/b]

I understand the question 1 b) i.e. convert to uppercase the entire line but can't do 1 a) i.e. invert the case. Question 1 a) says (according to me) to change upper to lower case and vice versa.

I couldn't get the question number 2. i.e. numbering lines.

These questions are from the book "UNIX concepts and applicaions" by Sumitabha Das
Chapter 20, question number 20.4 and 20.11
Last edited by ravisingh; 03-30-2013 at 01:45 AM..
 

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LEARN ABOUT MINIX

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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