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Full Discussion: Two Input Lines Into Single Output Line (CSV)
Top Forums Shell Programming and Scripting Two Input Lines Into Single Output Line (CSV) Post 302541331 by agama on Saturday 23rd of July 2011 09:42:17 PM
Old 07-23-2011
Hummm. For me it's doing what I expect. If you run it this way, without xargs, is anything different? (I'm assuming that you don't have many .txt files to run it this way.) I don't expect there to be any difference, but it never hurts to try.

Code:
awk '
FILENAME != last {
        fn = FILENAME;   
        gsub( ".txt", "", fn );      
        printf( "%s%s%s", n ? "\n" : "", fn, k ? "" : "," );
        last = FILENAME;
        n = 1;     # signal need for newline before fn (prevent lead newline)
        k = 0;     # when set, signals need for comma after fn
}

/ntp server/ {
    printf( ",%s", $0 );
    k = 1;
}

END {
    printf( "%s\n", k ? "" : "," );
}'  *.txt >out.csv

I also assume that if you execute ls *txt from the command line it lists all of the files you expect the awk to parse.

I'd guess that this line is tough to understand:
Code:
printf( "%s%s%s", n ? "\n" : "", fn, k ? "" : "," );

Each %s is replaced with a string from the parameter list. The parameters are an optional leading comma, the filename (without .txt) and an optional trailing comma. The tertiary operator has the form:

Code:
expression ?  true-action : false-action

So for n ? "\n" : "" the string with the newline (\n) is added to the printf string at the first %s when the variable n is non-zero. When n is zero, then a null-string (no comma) is added.

---------- Post updated at 21:42 ---------- Previous update was at 21:38 ----------

It did just occur to me that if you are running on a Sun, you need to use nawk rather than awk. I don't have a Sun box to test, but the symptom sure seems like the FILENAME variable isn't functioning as we'd expect and that does suggest a different version of awk.
 

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LEARN ABOUT SUNOS

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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