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Full Discussion: Abnormality while piping tr command output to sed
Top Forums Shell Programming and Scripting Abnormality while piping tr command output to sed Post 302746511 by Don Cragun on Wednesday 19th of December 2012 01:50:40 PM
Old 12-19-2012
In addition to the possibilities already listed, note that the standards only define the behavior of sed when the input is a text file. The output from the tr command is not a text file (by definition, the last character of a text file that is not an empty file is a <newline> character). The tr command you gave strips off the trailing <newline>; the echo command you gave supplies a trailing <newline>. If this is the problem, the tr|awk pipeline may work as you expect on some systems and produce no output at all (or do something completely different) on other systems.

Here are a couple of portable ways to do this:
Code:
awk 'NR==1{o = $0; next}
        {o = o "," $0}
END     {print o}' myfile

and:
Code:
#!/bin/ksh
(read o
while IFS="" read x
do      o="$o,$x"
done
printf "%s\n" "$o"
) < myfile

I use the Korn shell, but you can replace /bin/ksh in #!/bin/ksh with a path to any POSIX conforming shell on your system.
Last edited by Don Cragun; 12-21-2012 at 04:48 AM.. Reason: fixed typo
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT DEBIAN

image_to_j2k

IMAGE_TO_J2K(1) 						  OPENJPEG TOOLS						   IMAGE_TO_J2K(1)

NAME

       image_to_j2k - convert a PNM, PGM, PPM, PGX or BMP into a J2K or JP2 file

SYNOPSIS

DESCRIPTION

       image_to_j2k converts an image into a JPEG 2000-encoded image

OPTIONS

       -ImgDir sourcedir
	   Directory of PGM, PPM, PNM, PGX or BMP files to convert

       -OutFor extension
	   J2K or JP2 output file format

       -i source
	   PNM, PGM or PPM file to convert

       -o destination
	   J2K or JP2 file to output to

       -h  Display help information

       -cinema2k fps
	   Digital Cinema 2K profile compliant codestream for 2K resolution. 24 or 48 fps.

       -cinema4k [fps]
	   Digital Cinema 4K profile compliant codestream for 4K resolution. fps default is 24

       -r ratios
	   compression factor for successive layers, comma seperated

       -q psnr
	   psnr for successive layers, comma seperated

       -n rescount
	   number of resolutions

       -b blocksize
	   width and height of code block, comma-seperated

       -c precintsize
	   width and height of precinct, comma-seperated

       -t tilesize
	   width and height of tile, comma-seperated

       -p progression
	   progression order, one of LRCP, RLCP, RPCL, PCRL, CPRL

       -s subsampling
	   subsampling factor in X and Y, comma-seperated. Values larger than 2 can produce errors

       -POC orders
	   progression order change

       -SOP
	   write SOP marker before each packet

       -EPH
	   write EPH marker after each header packet

       -M modeflags
	   Sum of the values of the modes, as follows:

	   1. BYPASS (LAZY)
	   2. RESET
	   4. RESTART (TERMALL)
	   8. VSC
	   16. ERTERM (SEGTERM)
	   32. SEGMARK (SEGSYM)
       -x indexfile
	   create an index file

       -ROI:quantize
	   quantization indices upshifted for component c between 0 and 2 inclusive with an upshift of U between 0 and 37 inclusive

       -d imageoffset
	   X and Y offset of the origin of the image, comma-seperated

       -T tileoffset
	   X and Y offset of the origin of the tiles, comma-seperated

       -I  use the irreversible DWT 9-7

EXAMPLE

       ratios: 20,10,1	Quality 1: compress 20x; Quality 2: compress 10x; Quality 3: lossless compression

       psnr: 30,40,50

       quantize: c=0,U=25

       orders: T1=0,0,1,5,3,CPRL  Title 1: Resolution 0 start, component 0 start, layer 1 end, resolution 5 end, component 3 end, CPRL progression

AUTHOR

       Written by Paul Hampson <Paul.Hampson@Pobox.com> based on the output of image_to_j2k -h as part of the Debian packaging of OpenJPEG

COPYRIGHT

       Copyright 2007 Paul Hampson

SEE ALSO

       j2k_to_image(1), <http://www.openjpeg.org/index.php?menu=doc#encoder>

1.3+dfsg							    2014-04-22							   IMAGE_TO_J2K(1)
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