A twisted feature of sort when called in awk Post: 302377470

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Top Forums Shell Programming and Scripting A twisted feature of sort when called in awk Post 302377470 by radoulov on Friday 4th of December 2009 06:55:47 AM

12-04-2009

Registered User

Quote:

Yet a result like such, however, is not theoretically expected. Since sort appears within the loop body, it should sort each time when a name-tel pair is printed

The output is correct because this is how the AWK pipes work: in this case AWK opens the pipe once, during the first iteration of the loop. If I understand correctly, you would expect it to work this way:

Code:

% awk 'BEGIN {
  n = split("c a b", t)
  while (++i <= n) {
    print t[i] | "sort"
  close("sort")
   }
  }'
c
a
b

Note that the close command is inside the loop.

But it works like this:

Code:

% awk 'BEGIN {
  n = split("c a b", t)
  while (++i <= n)  
    print t[i] | "sort"
  }'
a                  
b
c

The AWK redirection is a source of confusion too, because it works the same way (you don't need >> to append).

Hope this helps.

radoulov

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cpanplus::shell

CPANPLUS::Shell(3pm)					 Perl Programmers Reference Guide				      CPANPLUS::Shell(3pm)

NAME

       CPANPLUS::Shell

SYNOPSIS

	   use CPANPLUS::Shell; 	    # load the shell indicated by your
					    # config -- defaults to
					    # CPANPLUS::Shell::Default

	   use CPANPLUS::Shell qw[Classic]  # load CPANPLUS::Shell::Classic;

	   my $ui      = CPANPLUS::Shell->new();
	   my $name    = $ui->which;	    # Find out what shell you loaded

	   $ui->shell;			    # run the ui shell

DESCRIPTION

       This module is the generic loading (and base class) for all "CPANPLUS" shells. Through this module you can load any installed "CPANPLUS"
       shell.

       Just about all the functionality is provided by the shell that you have loaded, and not by this class (which merely functions as a generic
       loading class), so please consult the documentation of your shell of choice.

BUG REPORTS

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AUTHOR

       This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

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

SEE ALSO

       CPANPLUS::Shell::Default, CPANPLUS::Shell::Classic, cpanp

perl v5.12.1							    2010-04-26						      CPANPLUS::Shell(3pm)