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Full Discussion: Help in Editing Records of a file
Top Forums Shell Programming and Scripting Help in Editing Records of a file Post 302772098 by mvona on Saturday 23rd of February 2013 01:48:13 AM
Old 02-23-2013
A small script to do the same...
Code:
    
#!/bin/bash
#tailer.sh
        if [ $# -lt "2" ]; then
        {
                echo "Sorry you need to pass the name of the first file followed by the name of the second file."
        }
                elif ! [ -e "$1" ] || ! [ -e "$2" ]; then
        {
                echo "Sorry I couldn't find your files"
        }
        fi
        #create a variable with the last line of the file to be augmented
        this_tail=`cat $1 | grep -v ^$ | tail -n 1`
        #output the first file, minus the last line, followed by the second file, followed by the last line of the first.
        (cat $1 | grep -v ^$ | grep -v "$this_tail") && (cat $2 | grep -v ^$) && echo $this_tail
    
exit

and here is the example output
Code:
bash tailer.sh tailed.txt insert.txt
00012919 7836049      S
00012920 7836049      S
00012921 3828157      Y
00012922 3828157      Y
00012923 3828157      S
00012956 7236046      S
00012942 3458235      Y
T005290070331000012923

 

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LEARN ABOUT OSX

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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