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Full Discussion: Grep trouble in Bash
Top Forums UNIX for Beginners Questions & Answers Grep trouble in Bash Post 302990135 by Don Cragun on Sunday 22nd of January 2017 08:13:09 PM
Old 01-22-2017
The grep -b option is not covered by the standards, and you haven't told us what OS or version of grep you're using. So grep -b and grep -v -b may do something completely different on your system from what it does on mine (which uses a grep from a BSD). With a BSD grep, the command:
Code:
grep -b 0 file

will print lines from file that contain the character 0 with each line preceded by the byte offset from the start of the file of the first byte on that line and a colon. And, the command:
Code:
grep -v -b 0 file

will print lines from file that do NOT contain the character 0 anywhere in that line with each line preceded by the byte offset from the start of the file of the first byte on that line and a colon.
 

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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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