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Full Discussion: Concatenation in awk not working
Top Forums Shell Programming and Scripting Concatenation in awk not working Post 302774073 by RudiC on Friday 1st of March 2013 05:50:23 AM
Old 03-01-2013
NO backtics in awk, please! And, using nested backtics like in your mv command needs escaping them. That's why backtics are deprecated and users are encouraged to use the $(...) form of command substitution.
In order to get the output of a shell command into an awk variable, you need to use command, pipe, and getline like in
Code:
$ awk '{"date +%d%m%y%k%M%S"|getline x; print x}' file
010313114139

BTW - the way you use the ls -ltr construct is far from optimal and would not fit mv usage, as both invocations may yield multiple files that mv does not handle that way. What's the reason to use it the way you do? Maybe there's other, improved ways to achieve the desired result.
 

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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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