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Full Discussion: txt file modification which is beyond me
Top Forums UNIX for Dummies Questions & Answers txt file modification which is beyond me Post 302551299 by forevertl on Tuesday 30th of August 2011 03:39:12 AM
Old 08-30-2011
questions
Hi,

Thank you for your reply! When I use the awk code, I got the new file like below which contains additonal rows which I don't want. How to remove them? by the way, what does '/^\s*$/' mean? I don't understand. Thanks!

1_q OMA1 2 43210
1_q OMA1 2 243007
1_q OMA1 2
1_q TFR1 3 429310
1_q TFR1 3 2412007
1_q TFR1 3 23366
1_q TFR1 3
1_q FTOMA1 5 3290
1_q FTOMA1 5 243317
1_q FTOMA1 5 24333
1_q FTOMA1 5 2433136
1_q FTOMA1 5 24334
1_q FTOMA1 5


Quote:
Originally Posted by daptal
Using Perl :

cat old_file | perl -e '
while(<>){
my ($chr,$gene,$count,$start) = split ;
print "$chr\t$gene\t$count\t$_\n" foreach (split(/,/,$start));
}
' > new_file

Using awk :
awk '{
split($4,arr,",");
for (tmp in arr) if (arr[tmp] !~ /^\s*$/) printf $1"\t"$2"\t"$3"\t"arr[tmp]"\n"
}' old_file > new_file
 

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LEARN ABOUT OSX

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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