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Full Discussion: insert multiple lines into a file
Top Forums Shell Programming and Scripting insert multiple lines into a file Post 302196387 by era on Sunday 18th of May 2008 05:35:06 AM
Old 05-18-2008
Your question basically boils down to "when is it safe to change something into something else"? Without knowledge of the file format you are manipulating, we can't really answer that question. But in broad terms, what you usually end up doing is examine more of the context. For example, instead of blindly modifying line number four, look for a line containing xxxx followed by a line containing yyyy, and only insert a line between those two if they are found. Whether to fail silently or throw an error if the change cannot be made obviously depends a lot on the context and the application.

Another common trick is to insert a comment block or something, and replace the comment block automatically.

Code:
## WARNING: vvvv automatically generated configuration, do not edit
setting='whatever your script puts here'
## WARNING: ^^^^

 

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LEARN ABOUT MOJAVE

ppi::token::comment5.18

PPI::Token::Comment(3)					User Contributed Perl Documentation				    PPI::Token::Comment(3)

NAME

       PPI::Token::Comment - A comment in Perl source code

INHERITANCE

	 PPI::Token::Comment
	 isa PPI::Token
	     isa PPI::Element

SYNOPSIS

	 # This is a PPI::Token::Comment

	 print "Hello World!"; # So it this

	 $string =~ s/ foo  # This, unfortunately, is not :(
	       bar
	       /w;

DESCRIPTION

       In PPI, comments are represented by "PPI::Token::Comment" objects.

       These come in two flavours, line comment and inline comments.

       A "line comment" is a comment that stands on its own line. These comments hold their own newline and whitespace (both leading and trailing)
       as part of the one "PPI::Token::Comment" object.

       An inline comment is a comment that appears after some code, and continues to the end of the line. This does not include whitespace, and
       the terminating newlines is considered a separate PPI::Token::Whitespace token.

       This is largely a convenience, simplifying a lot of normal code relating to the common things people do with comments.

       Most commonly, it means when you "prune" or "delete" a comment, a line comment disappears taking the entire line with it, and an inline
       comment is removed from the inside of the line, allowing the newline to drop back onto the end of the code, as you would expect.

       It also means you can move comments around in blocks much more easily.

       For now, this is a suitably handy way to do things. However, I do reserve the right to change my mind on this one if it gets dangerously
       anachronistic somewhere down the line.

METHODS

       Only very limited methods are available, beyond those provided by our parent PPI::Token and PPI::Element classes.

   line
       The "line" accessor returns true if the "PPI::Token::Comment" is a line comment, or false if it is an inline comment.

SUPPORT

       See the support section in the main module.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

COPYRIGHT

       Copyright 2001 - 2011 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.18.2							    2011-02-25						    PPI::Token::Comment(3)
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