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Full Discussion: help with columns and rows - script
Operating Systems Linux help with columns and rows - script Post 302531349 by Corona688 on Thursday 16th of June 2011 12:37:14 PM
Old 06-16-2011
Quote:
Originally Posted by yazu
POSIX shell
Code:
c=1
for f in `cat tmp.file`; do
  if [ $(($c % 15)) -ne 0 ]; then
    printf "$f "
  else
    echo
  fi
  c=$((c + 1))
done

  1. This is a combo useless use of cat and useless use of backticks. Loading an entire file into a variable to chop it like this is especially dangerous since, if the file is larger than the maximum size of a shell variable, the end will get chopped off.
  2. You shouldn't feed variables into printf's command string unless you can control exactly what they are. It will throw up on or mangle anything with % or \ in it.
  3. It ignores every fifteenth cell.
  4. It may end up printing the last line without an ending line-feed, which may prevent the last line from being read by various UNIX utilities like sed and awk.
  5. It would require a KSH or KSH-like shell, for the $(( )) math syntax.

Code:
c=0
MAX=15
PREFIX=""
# read lines
while read f
do
        # split lines into $1, $2, ...
        set -- $f
        for d in $*
        do
                if [ `expr $c % $MAX` -eq 0 ]
                then
                        # PREFIX being blank prevents extra blank line on the very first line
                        printf "${PREFIX}%s" "$d"
                        PREFIX="\n"
                else
                        printf " %s" "$d"
                fi

                c=`expr $c + 1`       
        done
done < tmp.file

echo

Last edited by Corona688; 06-16-2011 at 01:50 PM..
 

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LEARN ABOUT DEBIAN

pfspad

pfspad(1)						      General Commands Manual							 pfspad(1)

NAME

       pfspad - Add borders to a frame in PFS stream

SYNOPSIS

       pfspad  [--left	<columns>]  [--right <columns>] [--top <rows>] [--bottom <rows>] [--width <new_width>] [--height <new_height>] [--R <val>]
       [--G <val>] [--B <val>] [--Y <val>] [--help]

DESCRIPTION

       Add borders to each frame in PFS stream. User specifies size of left, right, top and bottom border or size of an  output  image.  Color	of
       borders can be specified as well.

OPTIONS

       --left <columns>, -l <columns>
	      Width in pixels of the left border.

       --right <columns>, -r <columns>
	      Width in pixels of the right border.

       --top <rows>, -t <rows>
	      Height in pixels of the top border.

       --bottom <rows>, -b <rows>
	      Height in pixels of the bottom border.

       --width <new_width>, -W <new_width>
	      Width of an output image. Note that --width can be mixed with either --left or --right option.

       --height <new_height>, -H <new_height>
	      Height of an output image. Note that --height can be mixed with either --top or --bottom option.

       --R <val>, -R <val>, --G <val>, -G <val>, --B <val>, -B <val>
	      Color of borders in RGB mode. Default color is black, and if some of the components is not specified, its value is set to 0.0.

       --Y <val>, -Y <val>
	      Color of borders in luminance mode.

       --help, -h
	      Print a list of commandline options.

EXAMPLES

       pfsin image.hdr | pfspad --left 50 --bottom 20 | pfsout out.hdr
	      Add 50 columns to the left and 20 rows to the bottom side of image.hdr.  Color of borders is default black.

       pfsin image.hdr | pfspad --top 20 --height 500 --width 400 --R 1.0 | pfsout out.hdr
	      Add 20 rows to the top side of image.hdr and create output image out.hdr 500 pixels in height and 400 pixels in width. Color of bor-
	      ders is set to red.

SEE ALSO

       pfsin(1) pfsout(1)

BUGS

       Please report bugs and comments to Dorota Zdrojewska <dzdrojewska@wi.ps.pl>.

																	 pfspad(1)
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