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Resetting your Terminal for each line printed

by ghenry (Vicar)
on Sep 27, 2006 at 07:44 UTC ( #575100=perlquestion: print w/replies, xml ) Need Help??
ghenry has asked for the wisdom of the Perl Monks concerning the following question:

Dear Master Monks,

I've got a blank mind this morning, as I am trying to think how to print on my console but wipe it after each print.

I am just testing like so, but I can't think of a better way (console width independent) than just printing a certain amount of blanks (by adding print ' ' x 80;):

#!/usr/bin/perl use strict; use warnings; # Autoflush Output $| = 1; for my $num (1..100) { print 'Testing long line print', "\r"; print 'Printing over', "\r"; print $num, "\r"; sleep 1; }

Should I search for some Term::* module?


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Fancy a Just ask!!!

Replies are listed 'Best First'.
Re: Resetting your Terminal for each line printed
by Skeeve (Vicar) on Sep 27, 2006 at 07:50 UTC
    If I need something like that I always go for ANSI codes.
     print "\x27[2J";

Re: Resetting your Terminal for each line printed
by liverpole (Monsignor) on Sep 27, 2006 at 11:02 UTC
    Hi ghenry,

    From your question:

        (by adding print ' ' x 80;)

    it looks like you mean you wish to clear to the end of the line, is that correct?

    If so, use <escape>[K like so:

    print "\e[K";

    Some of the escape sequences I use all the time are:

    print "\e[H"; # Put the cursor on the first line print "\e[J"; # Clear from cursor to end of screen print "\e[H\e[J"; # Clear entire screen (just a combination +of the above) print "\e[K"; # Clear to end of current line (as stated +previously) print "\e[m"; # Turn off character attributes (eg. color +s) printf "\e[%dm", $N; # Set color to $N (for values of 30-37, or + 100-107) printf "\e[%d;%dH", $R, $C; # Put cursor at row $R, column $C (good fo +r "drawing")

Re: Resetting your Terminal for each line printed
by BrowserUk (Pope) on Sep 27, 2006 at 07:52 UTC

    Try this

    perl -wle"$|=1; printf qq[\r$_\t] and sleep 1 for reverse 1 .. 60"

    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
Re: Resetting your Terminal for each line printed
by Fletch (Chancellor) on Sep 27, 2006 at 14:10 UTC

    There's Term::Cap which would let you find the current terminal's clear-to-end-of-line which you could print after your CR.

    Of course if you want to go the whole way there's also Curses.

    Update: The other solutions hard coding VT100-esque sequences are going to work on probably 70+% of the terminals you'll encounter (xterm, kconsole, iTerm, et al), but use Term::Cap if you want to make sure you work regardless of the terminal (presuming correct entries in the system's termcap file :).

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