What's wrong my sed? Post: 302668029

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Top Forums Shell Programming and Scripting What's wrong my sed? Post 302668029 by alister on Sunday 8th of July 2012 12:02:46 PM

07-08-2012

Registered User

Quote:

Originally Posted by yanglei_fage

Code:

$ cat ./xx.sh 
#!/bin/bash
while read line
do
    sed -n '/${line}/p' ./file2
done < ./file1

You did not show the desired output for the sample data, so I'm assuming that your goal is to print out each line in file2 that contains a line in file1 as a substring.

Code:

grep -Ff file1 file2

Regards,
Alister

---------- Post updated at 12:02 PM ---------- Previous update was at 11:58 AM ----------

Quote:

Originally Posted by yanglei_fage

"The sed command will not work because of the / delimiter"
if I change the sed to " sed -i '%${line}%d' file2" it still get error
sed: -e expression #1, char 1: unknown command: `%'

To use a different delimiter for an address, the opening delimiter must be backslash-escaped (this is not necessary when using a different delimiter to delimit the components of a substitute, s, command).

However, any sed solution will treat literal text as a regular expression. That is a very poor approach. Each . in file1 will match any character at all. Each * will allow the preceding character to occur an arbitrary number of times, or to not occur at all. And so it goes with all regular expression metacharacters.

Regards,
Alister

Last edited by alister; 07-08-2012 at 01:22 PM..

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LEARN ABOUT V7

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)