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Full Discussion: stderr & stdout to a file and the right exit code
Top Forums Shell Programming and Scripting stderr & stdout to a file and the right exit code Post 302085495 by dsravan on Thursday 17th of August 2006 01:40:12 PM
Old 08-17-2006
Just wondering if any one can help me understand how the below bolded code works.

Quote:
(
mv files.log file.log
EXITSTATUS=$?
if [ ${EXITSTATUS} -ne 0 ]
then
exit ${EXITSTATUS}
fi
) 3>&1 1>&2 2>&3 |tee -a logfile
echo $?
echo "exit code" $EXISTATUS
Quote:
3>&1 1>&2 2>&3 how does this work or what does it mean?
 

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LEARN ABOUT OPENSOLARIS

ppmtopgm

ppmtopgm(1)                                                   General Commands Manual                                                  ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and  pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

                                                                   10 April 2000                                                       ppmtopgm(1)
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