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Full Discussion: Inputs argument for sh -c
Top Forums Shell Programming and Scripting Inputs argument for sh -c Post 303008439 by Corona688 on Friday 1st of December 2017 10:23:21 AM
Old 12-01-2017
Quote:
Originally Posted by puertas12
Can someone give a source to start digging on this?
Advanced Bash-Scripting Guide

Quote:
Furthermore. Can someone clarify the following:
$0 $1 $2 ... After the sh -c
They are not the same $0 $1 $2 variables as your own shell. They are in single quotes:
Code:
'echo "Dumping file: $2" >> "$1"; w3m "$2" >> "$1" 2>&1'

...so they are passed into sh -c unparsed, for it to handle.

I have my doubts about them too.
Quote:
$1: name of the log file Why ??? From where is taken
Nowhere, I think. There is a different form of shell code which I think they tried to adapt from:

Code:
echo 'echo arg1 $1 arg2 $2 arg3 $3 arg4 $4' | sh -s -- a b c d

This runs with the result:
Code:
arg1 a arg2 b arg3 c arg4 d

...But it runs code from standard input, not -c, so can't be used with xargs.

Someone tried to adapt that into a form suitable for xargs and didn't know what those arguments were for, so left them dangling.
 

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LEARN ABOUT OPENSOLARIS

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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