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Full Discussion: grep help after context
Top Forums Shell Programming and Scripting grep help after context Post 302419779 by dips_ag on Saturday 8th of May 2010 04:04:21 PM
Old 05-08-2010
grep help after context
Hi,

There's a file with below contents which I have to read based on the input parameter provided by the user.
Code:
 
FILE_ID=1
FILE_FTP_ID=ftp.server1.com
FILE_FTP_USER=user1
FILE_FTP_PASS=pass1
 
FILE_ID=2
FILE_FTP_ID=ftp.server2.com
FILE_FTP_USER=user2
FILE_FTP_PASS=pass2
 
FILE_ID=3
FILE_FTP_ID=ftp.server3.com
FILE_FTP_USER=user3
FILE_FTP_PASS=pass3
 
FILE_ID=4
FILE_FTP_ID=ftp.server4.com
FILE_FTP_USER=user4
FILE_FTP_PASS=pass4

For e.g. if user entered 1

Code:
 
./ftp_files 1

Then the script should only read the first block i.e. and assign the values for ftp site, user & pass,etc....

Code:
FILE_ID=1
FILE_FTP_ID=ftp.server1.com
FILE_FTP_USER=user1
FILE_FTP_PASS=pass1

which I am doing with the below command
Code:
grep -A3 "FILE_ID=$1" ftp_info_file

Now the problem is that no. of lines between
Code:
FILE_ID=1
FILE_ID=2

may vary (there could be more information to read); so -A3 would not help me. I need to know dynamically some how the no. of lines between the first and the next pattern.
I thought of something like using -m & -n options of grep
Code:
grep -m `cat ftp_info_file | wc -l` "FILE_ID" -n ftp_info_file

which displays lines matched with the line numbers and then I can subtract those numbers to get no. of lines between the two contiguous groups of matches. But I am wondering if there's a neater way to do it?
Please suggest.

-dips
 

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LEARN ABOUT LINUX

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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