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    <p>Before actually using GUI dialogues, consider using console prompts. Quite often you can get away with simple "y/n?" prompts, which in bash you achieve via the <a href="http://www.manpagez.com/man/2/read/" rel="noreferrer"><code>read</code> command</a>..</p> <pre><code>read -p "Do something? "; if [ $REPLY == "y" ]; then echo yay; fi </code></pre> <p>If console prompt's just won't cut it, <a href="http://freshmeat.net/projects/zenity" rel="noreferrer">Zenity</a> is really <a href="http://library.gnome.org/users/zenity/stable/" rel="noreferrer">easy to use</a>, for example:</p> <pre><code> zenity --error --text="Testing..." zenity --question --text="Continue?" </code></pre> <p>This only works on Linux/Gnome (or rather, it'll only be installed by default on such systems). The <code>read</code> method will work on pretty much any platform (including headless machines, or via SSH)</p> <p>If you need anything more complex than what read or Zenity provides, "change to C++" is really the best method (although I'd recommend Python/Ruby over C++ for such shell-script-replacement tasks)</p> <blockquote> <p>I want to do simple interface for some strange game, the progress bar for health or something is the example for what I want. Variable "HEALTH" is 34, so make progress bar filled in 34/100</p> </blockquote> <p>As a command-line script, it'd use Python:</p> <pre><code>$ export HEALTH=34 $ python -c "import os; print '*' * int(os.environ.get('HEALTH', 0))" ********************************** </code></pre> <p>Or to normalise the values between 1 and 78 (so you don't get line-wrapping on a standard terminal size):</p> <pre><code>$ python -c "import os; print '*' * int((int(os.environ.get('HEALTH', 0)) / 100.0) * 78)" </code></pre> <p>Zenity also has a <a href="https://help.gnome.org/users/zenity/stable/progress.html.en" rel="noreferrer">Progress Dialog</a>,</p> <pre><code>#!/bin/sh ( echo "10" ; sleep 1 echo "# Updating mail logs" ; sleep 1 echo "20" ; sleep 1 echo "# Resetting cron jobs" ; sleep 1 echo "50" ; sleep 1 echo "This line will just be ignored" ; sleep 1 echo "75" ; sleep 1 echo "# Rebooting system" ; sleep 1 echo "100" ; sleep 1 ) | zenity --progress \ --title="Update System Logs" \ --text="Scanning mail logs..." \ --percentage=0 if [ "$?" = -1 ] ; then zenity --error \ --text="Update canceled." fi </code></pre> <p>As I said before, if Zenity cannot do what you need, look into writing your game-thing as a "proper" script in Python/Ruby/Perl/C++/etc as it sounds like you're pushing the bounds of what a shell-script can do..</p>
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    1. COI don't want the yes/no, but I want to do simple interface for some strange game, the progress bar for health or something is the example for what I want. Variable "HEALTH" is 34, so make progress bar filled in 34/100. That I want to do.
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