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Full Discussion: sed escape character for comment string "/*"
Top Forums Shell Programming and Scripting sed escape character for comment string "/*" Post 302524550 by agama on Monday 23rd of May 2011 06:42:24 PM
Old 05-23-2011
Your problem is that within double quotes, the shell will expand file globbing "wildcards" and you'll get a list of files and directories in the present directory for your "*". Usually this is solved by using single quotes, no expansion done within singles by the shell, but that won't allow you to use your variables as you'd like. I'm not a huge fan of this, but it does work if you "mix" your quotes:

Code:
sed 's/ /&\/\* bm='"$bmid"'run='"$runid"' \*\/ /'

Single quotes round everything except the variables; doubles round those. I don't like this because it's a maintenance headache. I also like to make a practice of not using escapes if I don't have to -- easier to read:

Code:
sed 's! !&/* bm='"$bmid"'run='"$runid"' */ !'

wil do the same thing. When using sed on file paths, or anything with slants, use an alternate delimiting character (!) in this case. It still uses the mixed quotes, but IMHO it's a bit easier to read.
Last edited by agama; 05-23-2011 at 07:43 PM.. Reason: clarification
 

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LEARN ABOUT CENTOS

perl::critic::policy::valuesandexpressions::prohibitquotesasquot

Perl::Critic::Policy::ValuesAndExpressions::ProhibitQuotPerl::Critic::Policy::ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters(3)

NAME

       Perl::Critic::Policy::ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters - Don't use quotes ("'", """, "`") as delimiters
       for the quote-like operators.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       With the obvious exception of using single-quotes to prevent interpolation, using quotes with the quote-like operators kind of defeats the
       purpose of them and produces obfuscated code, causing problems for future maintainers and their editors/IDEs.

	   $x = q"q";		     #not ok
	   $x = q'q';		     #not ok
	   $x = q`q`;		     #not ok

	   $x = qq"q";		     #not ok
	   $x = qr"r";		     #not ok
	   $x = qw"w";		     #not ok

	   $x = qx`date`;	     #not ok

	   $x =~ m"m";		     #not ok
	   $x =~ s"s"x";	     #not ok
	   $x =~ tr"t"r";	     #not ok
	   $x =~ y"x"y";	     #not ok

	   $x =~ m'$x'; 	     #ok
	   $x =~ s'$x'y';	     #ok
	   $x = qr'$x'm;	     #ok
	   $x = qx'finger foo@bar';  #ok

CONFIGURATION

       This policy has three options: "single_quote_allowed_operators", "double_quote_allowed_operators", and "back_quote_allowed_operators",
       which control which operators are allowed to use each of "'", """, "`" as delimiters, respectively.

       The values allowed for these options are a whitespace delimited selection of the "m", "q", "qq", "qr", "qw", "qx", "s", "tr", and "y"
       operators.

       By default, double quotes and back quotes (backticks) are not allowed as delimiters for any operators and single quotes are allowed as
       delimiters for the "m", "qr", "qx", and "s" operators.  These defaults are equivalent to having the following in your .perlcriticrc:

	   [ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters]
	   single_quote_allowed_operators = m s qr qx
	   double_quote_allowed_operators =
	   back_quote_allowed_operators =

SUGGESTED BY

       Michael Schwern

AUTHOR

       Elliot Shank "<perl@galumph.com>"

COPYRIGHT

       Copyright (c) 2007-2011 Elliot Shank.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module.

perl v5.16.3						Perl::Critic::Policy::ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters(3)
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