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Full Discussion: Merging two columns from two files with similar names into a loop
Top Forums Shell Programming and Scripting Merging two columns from two files with similar names into a loop Post 302706145 by valente on Wednesday 26th of September 2012 08:45:13 AM
Old 09-26-2012
Merging two columns from two files with similar names into a loop
I have two files like this:
fileA.net
Code:
A
B
C

fileA.dat
Code:
1
2
3

and I want the output

output_expected
Code:
A 1
B 2
C 3

I know that the easier way is to do a paste fileA.net fileA.dat, but the problem is that I have 10,000 couple of files (fileB.net with fileB.dat; fileC.net with fileC.dat ....) and it is not feasible by hand.
So I tried to insert the next script into a loop for:
Code:
for a in *.net
do
  name=`echo $a |sed 's/.net/.dat`
  two=`cat $name`
  echo -e "$a"'\t'"two" > $a.output_observed
done

However, the output was
fileA.net.output_observed
Code:
A
B
C    1
2
3

Is it possible to apply the paste command for two variables? I tried this, but it was reported that the list is too long, or something like this. Somebody know a smart way to merge two columns of files with similar names in large scale, due to have 10,000 of files?

Best regards.
Last edited by Franklin52; 09-26-2012 at 09:54 AM.. Reason: Please use code tags for data and code samples
 

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LEARN ABOUT REDHAT

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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