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Top Forums UNIX for Beginners Questions & Answers Calling system() if certain text appears on the screen. Post 303033220 by bakunin on Monday 1st of April 2019 05:48:12 PM
Old 04-01-2019
Quote:
Originally Posted by ignatius
I'm wondering if it is possible to execute system(), if a certain string of text appears on the screen or not?
I want to be able to run system("rz -Z") based on if "B00000000000000" appears on the screen.
I don't see why not. "appears on screen" means basically it is part of the output stream of your tty device - intercept that and you will be able to notice when the string appears there. You will also have to find out which terminal you are attached to.

I hope this helps.

bakunin
 

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noseguy(6x)							XScreenSaver manual						       noseguy(6x)

NAME
noseguy - a little guy with a big nose wanders around being witty SYNOPSIS
noseguy [-display host:display.screen] [-foreground color] [-background color] [-text-foreground color] [-text-background color] [-font font] [-window] [-root] [-install] [-visual visual] [-mode mode] [-program program] [-filename file] [-text text] [-fps] DESCRIPTION
A little man with a big nose and a hat runs around spewing out messages to the screen. This code (and its bitmaps) were extracted from the xnlock program. OPTIONS
noseguy accepts the following options: -window Draw on a newly-created window. This is the default. -root Draw on the root window. -install Install a private colormap for the window. -visual visual Specify which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual. -font font The font used for the messages. -program program This program will be run periodically, and its output will be the text of the messages. Default: xscreensaver-text --cols 40 | head -n15 You can configure the text printed through the "Advanced" tab of xscreensaver-demo(1), or by editing your ~/.xscreensaver file. -filename file If mode is file, then the contents of this file will be used for all messages. -text string If mode is string, then this text will be used for all messages. -fps Display the current frame rate and CPU load. ENVIRONMENT
DISPLAY to get the default host and display number. XENVIRONMENT to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property. SEE ALSO
X(1), xscreensaver(1), xscreensaver-text(1), xnlock(1) COPYRIGHT
Copyright 1985, 1990 by Dan Heller <argv@danheller.com>. AUTHOR
Dan Heller <argv@danheller.com>, 1985. Ability to run standalone or with xscreensaver added by Jamie Zawinski <jwz@jwz.org>, 13-aug-92. X Version 11 5.15 (28-Sep-2011) noseguy(6x)
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