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Full Discussion: delimiter contents
Top Forums Shell Programming and Scripting delimiter contents Post 302485738 by radoulov on Thursday 6th of January 2011 05:14:54 AM
Old 01-06-2011
Quote:
I have two question wrt the field separator.
If the field separator is ^A in the file, why do we have 2 backslashes, i thought one would be enough.
If 2 backslashes it mean literally FS= \^A
Good questions.
From the GNU awk manual (p 46,-47 from rhe pdf version)

Quote:
... with Unix awk and gawk, the
assignment ‘FS = "\.."' assigns the character string ".." to FS (the backslash is stripped).
This creates a regexp meaning “fields are separated by occurrences of any two characters.”
If instead you want fields to be separated by a literal period followed by any single character,
use ‘FS = "\\.."'.
So in the assignment you loose one backslash and in order to get \^ you need \\^.

Quote:
How does adding another one backslash to the existing 2 backslashes work in the script.?
This is special to the old-style backquote form of substitution `...`, it just removes a \
when it's followed by another \, from the manual pages of bash:

Quote:
When the old-style backquote form of substitution is used, backslash retains its literal meaning except when
followed by $, `, or \. The first backquote not preceded by a backslash terminates the command substitution.
When using the $(command) form, all characters between the parentheses make up the command; none are treated
specially.
Code:
% printf '%s\n'  `printf '%s' '\\a'`  
\a
% printf '%s\n'  $(printf '%s' '\\a') 
\\a

 

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LEARN ABOUT DEBIAN

page_util_quote

page_util_quote(3tcl)					      Parser generator tools					     page_util_quote(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       page_util_quote - page character quoting utilities

SYNOPSIS

       package require page::util::quote  ?0.1?

       package require snit

       ::page::util::quote::unquote char

       ::page::util::quote::quote'tcl char

       ::page::util::quote::quote'tclstr char

       ::page::util::quote::quote'tclcom char

_________________________________________________________________

DESCRIPTION

       This package provides a few utility commands to convert characters into various forms.

API

       ::page::util::quote::unquote char
	      A  character,  as stored in an abstract syntax tree by a PEG processor (See the packages grammar::peg::interpreter, grammar::me, and
	      their relations), i.e. in some quoted form, is converted into the equivalent Tcl character. The character is returned as the  result
	      of the command.

       ::page::util::quote::quote'tcl char
	      This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser, will
	      regenerate the character in question and is 7bit ASCII. The string is returned as the result of this command.

       ::page::util::quote::quote'tclstr char
	      This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl  parser  and
	      will generate a human readable representation of the character in question.  The string is returned as the result of this command.

	      The  string  does not use any unprintable characters. It may use backslash-quoting. High UTF characters are quoted to avoid problems
	      with the still prevalent ascii terminals. It is assumed that the string will be used in a double-quoted environment.

       ::page::util::quote::quote'tclcom char
	      This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser  when
	      used within a Tcl comment. The string is returned as the result of this command.

BUGS, IDEAS, FEEDBACK
       This  document,	will  undoubtedly  contain  bugs  and  other  problems.  Please report such in the category page of the Tcllib SF Trackers
       [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have.

KEYWORDS

       page, parser generator, quoting, text processing

CATEGORY

       Page Parser Generator

COPYRIGHT

       Copyright (c) 2007 Andreas Kupries <andreas_kupries@users.sourceforge.net>

page									1.0						     page_util_quote(3tcl)
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