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Full Discussion: How to combine lines within range of pattern
Top Forums Shell Programming and Scripting How to combine lines within range of pattern Post 302350822 by drl on Saturday 5th of September 2009 03:25:10 PM
Old 09-05-2009
Hi.

If you like the /first/, /last/ notation of sed, there is a similar construct in perl, namely the range operator, "..", and, in the context of lines, it works as you wanted the sed construct to work (it can also used as a list generator). The perl script is a bit more verbose than the awk scripts, but it may be more readable:
Code:
#!/usr/bin/perl

# @(#) p2	Demonstrate line-join within specific range.

use warnings;
use strict;

my ($debug);
$debug = 0;
$debug = 1;

my ($in_sequence) = 0;
while (<>) {
  if ( /[(]NP/ .. /[)]$/ ) {
    $in_sequence++;
    chomp;
    print "$_ ";
    next;
  }
  elsif ($in_sequence) {
    $in_sequence = 0;
    print "\n";
  }
  print;
}

exit(0);

Assuming data is on file "data1", the script then produces:
Code:
% ./p2 data1
line 1
line 2
(NP line 3 line 4 line 5) 
line 6

The parentheses are special in the matching operation, so we escape them. One way is to precede them with a backslash, but some people like readability of single characters in square brackets.

We go through the file and whenever we are in the appropriate range, we print the line without the newline, and move onto the next line. If outside, we check to see if we have completed a join, and if so, print a newline, print the current line in any case, and loop. There is also a triple-dot operator, research on which is left as an exercise for the reader.

Best wishes... cheers, drl
 

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LEARN ABOUT MINIX

ed

ED(1)							      General Commands Manual							     ED(1)

NAME

       ed - editor

SYNOPSIS

       ed file

OPTIONS

       -      Suppress line/byte count messages (for in scripts)

EXAMPLES

       ed prog.c	   # Edit prog.c

       echo '1,$p' | ed - file
			   # Odd way to write 'cat file'

DESCRIPTION

       Ed is functionally equivalent to the standard V7 editor, ed.  It supports the following commands:

	    (.) a: append
	    (.,.)c: change
	    (.,.)d: delete
		e: edit new file"
		f: print name of edited file"
	    (1,$)g: global command
	    (.) i: insert
	    (.,.+1)j: join lines together
	    (.) k: mark
	    (.) l: print with special characters in octal
	    (.,.)m: move
	    (.,.)p: print
		q: quit editor"
	    (.) r: read in new file
	    (.,.)s: substitute
	    (1,$)v: like g, except select lines that do not match
	    (1,$)w: write out edited file
       Many of the commands can take one or two addresses, as indicated above.	The defaults are shown in parentheses.	Thus a appends to the cur-
       rent line, and g works on the whole file as default.  The dot refers to the current line.  Below is a sample editing session with  comments
       given following the # symbol.

	    ed prog.c		# Edit prog.c
	    3,20p		# Print lines 3 through 20
	    /whole/		# Find next occurence of whole
	    s/whole/while/	# Replace whole by while
	    g/Buf/s//BUF/g	# Replace Buf by BUF everywhere
	    w			# Write the file back
	    q			# Exit the editor
       Ed  is  provided  for  its  sentimental value.  If you want a line-oriented editor, try ex.  If you want a good editor, use elle, elvis, or
       mined.

SEE ALSO

       elvis(1), elle(9), mined(9).

																	     ED(1)
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