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Full Discussion: find and replace a string in a file without the use of temp file
Top Forums Shell Programming and Scripting find and replace a string in a file without the use of temp file Post 302343951 by raghutapal on Friday 14th of August 2009 07:51:06 AM
Old 08-14-2009
Quote:
Originally Posted by panyam
Something like this :

Code:
perl -i -pe 's/OLD/NEW/ '  File_name.txt

Thanks Panyam.It works great.
Could you please explein me how the above command works.
I am new to perl

Thanks
Raghu

---------- Post updated at 06:51 AM ---------- Previous update was at 06:45 AM ----------

***************************************************

Thanks to vgersh99 for that example:
Code:
printf '1,$ s/OLD/NEW/g\nw! infile\nq!'| ex - infile

[/quote]

Thanks Vgersh.That works great.
Can you please explain me the above code in detail.I have never used such command to find replace a string in a file before

Regards
Raghu
 

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LEARN ABOUT MOJAVE

ppi::token::quote

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

NAME

       PPI::Token::Quote - String quote abstract base class

INHERITANCE

	 PPI::Token::Quote
	 isa PPI::Token
	     isa PPI::Element

DESCRIPTION

       The "PPI::Token::Quote" class is never instantiated, and simply provides a common abstract base class for the four quote classes.  In PPI,
       a "quote" is limited to only the quote-like things that themselves directly represent a string. (although this includes double quotes with
       interpolated elements inside them).

       The subclasses of "PPI::Token::Quote" are:

       '' - PPI::Token::Quote::Single
       "q{}" - PPI::Token::Quote::Literal
       "" - PPI::Token::Quote::Double
       "qq{}" - PPI::Token::Quote::Interpolate

       The names are hopefully obvious enough not to have to explain what each class is here. See their respective pages for more details.

       Please note that although the here-doc does represent a literal string, it is such a nasty piece of work that in PPI it is given the honor
       of its own token class (PPI::Token::HereDoc).

METHODS

   string
       The "string" method is provided by all four ::Quote classes. It won't get you the actual literal Perl value, but it will strip off the
       wrapping of the quotes.

	 # The following all return foo from the ->string method
	 'foo'
	 "foo"
	 q{foo}
	 qq <foo>

   literal
       The "literal" method is provided by ::Quote:Literal and ::Quote::Single.  This returns the value of the string as Perl sees it: without the
       quote marks and with "\" and "'" resolved to "" and "'".

       The "literal" method is not implemented by ::Quote::Double or ::Quote::Interpolate yet.

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::Quote(3)
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