Speculative Shell Feature Brainstorming Post: 302514403

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The Lounge What is on Your Mind? Speculative Shell Feature Brainstorming Post 302514403 by Corona688 on Friday 15th of April 2011 03:29:19 PM

04-15-2011

Registered User

Another way to handle anonymous files could be similar to the awk way. When you redirect a file in awk, it stays open, referring to the same filename later just gets you the same handle over and over.

Code:

LINE=1
# Read lines from "otherfile" and "cmpfile" one by one, without
# redirecting the entire loop's stdin.
# Also set the close-on-exec flag for files opened in this fashion.
while read LINE <<"otherfile" && read OTHERLINE <<"cmpfile"
do
        if [ "$LINE" != "$OTHERLINE" ]
        then
                echo "Line $LINE doesn't match"
                echo "What would you like to do?"

                read RESPONSE
                case "${RESPONSE}" in
                *)   # todo: something
                      ;;
                 esac
        fi
        ((LINE++))
done

close "cmpfile" "otherfile"

Using << for 'keep the file open' seems a nice opposite of the >> 'append to file' redirection. This breaks the syntax for here-documents though. Not quite sure how to get the FD out of that either, maybe $<"filename" ?

Last edited by Corona688; 04-15-2011 at 04:35 PM..

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LEARN ABOUT MOJAVE

cpanplus::shell

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

NAME

       CPANPLUS::Shell - base class for CPANPLUS shells

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

       Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>.

AUTHOR

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

COPYRIGHT

       The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved.

       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 v5.18.2							    2014-01-06						      CPANPLUS::Shell(3pm)