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Full Discussion: Sendig a file and a confirm file
Top Forums Shell Programming and Scripting Sendig a file and a confirm file Post 302800681 by mjf on Tuesday 30th of April 2013 08:46:59 AM
Old 04-30-2013
Below is just one example of how you can define a trailer record at the end of the file. The trailer record has a record type (1st char of rec) of '3' and is followed by the total count (000004) of detail records (those with a record type of '2' in this example). The process that reads this file after it's transferred should count the number of actual detail records on the file and compare that number to the total count on the trailer record. If the count is different or if no trailer record is found, then that means that the transfer or file is incomplete. This file also contains a header record with a date which the process can also validate so an older or unexpected file is not processed. Surely there can be many variations to this.
Code:
 
cat file.txt
1 20130430
2 Detail Rec 1
2 Detail Rec 2
2 Detail Rec 3
2 Detail Rec etc
3 000004

 

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LEARN ABOUT DEBIAN

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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