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Homework and Emergencies Emergency UNIX and Linux Support Read file and change a 0 to a 1 in output Post 302358085 by otheus on Thursday 1st of October 2009 10:13:52 AM
Old 10-01-2009
Quote:
I want it to write this info to the file, not to create a new one.
This doesn't happen. A new file is ALWAYS written and the old file replaced. This is simply the method used by operating systems for "text" files of any sort.

The second problem is that you want to check "if it doesn't exist" and then place it there. Well, you can't really do that in one pass. The best solution is to Put it there and remove any existing ones.

So:
Code:
awk '
   /<key>ExcludeSimpleHostnames</ { s=1; next; } 
   s && /<integer>[0-9]*</integer>/ { s=0; next;} 
   /<key>Proxies</ { p=1 } 
   p && /<\/array>/ {
                print; 
                print "<key>ExcludeSimpleHostnames</key>";
                print "<integer>1</integer>"; 
                p=0; next; } 
    { print; }'

If you want to use the integer value found in this proxy section, you're kind of screwed -- you have to either do backtracking or two passes or create a metastructure of all the data and write it out again to XML. That's because you want the ExcludeSimpleHostnames key to follow the array in the output, but the input, it might occur later.

Last edited by otheus; 10-01-2009 at 11:15 AM.. Reason: formatted code
 

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Boulder::String(3pm)					User Contributed Perl Documentation				      Boulder::String(3pm)

NAME
Boulder::String - Read and write tag/value data from a string. SYNOPSIS
#!/bin/perl # Read a B<Stone> from stdin and create a string that can be # passed to a dumb sub, which doesn't know about Stones. use Boulder::Stream; use Boulder::String; my $stream = Boulder::Stream->newFh; # read a stone from stdin my $record = <$stream> ); print $stream $record; } DESCRIPTION
Boulder::String provides access to Boulder IO hierarchical tag/value data. Stone objects printed to the tied string are appended to the string in Boulder format. Boulder::Stream METHODS $stream = Boulder::Stream->new($in_string,$out_string); The new() method creates a new Boulder::String object. You must provide an input string and a reference to an output string. The input string may be empty. $stream->write_record($stone) Write the passed stone in Boulder IO format into $out_string. AUTHOR
Lincoln D. Stein <lstein@cshl.org>, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY. This module can be used and distributed on the same terms as Perl itself. Patches and bug fixes contributed by Bernhard Schmalhofer <bernhard@biomax.de>. SEE ALSO
Boulder, Boulder::Stream, Boulder::Blast, Boulder::Genbank, Boulder::Medline, Boulder::Unigene, Boulder::Omim, Boulder::SwissProt perl v5.10.1 2000-12-04 Boulder::String(3pm)
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