interactive

Is there a way to "push" a string to the stdin stream of a program when calling it? So that we would have the effect of echo "something" | ./my_program but instead of reading EOF after "something" , my_program would read its further input from the original stdin (e.g., the keyboard). Example: Say we want to start a bash shell, but the first thing we would like to do inside it is to call date . echo date | bash would not do the job, as the shell would terminate after running date . Jonathan Leffler This might work: (echo "something"; cat -) | ./my_program It creates a sub-shell where the first

Very similar to this question: How can I start an interactive console for Perl? I just want to be able to start entering VBS statements, one at a time, and have them evaluated straight away, like Python's IDLE. Ansgar Wiechers I wrote this a couple years ago. It's based on this blog post (archived here ), but with a couple enhancements. Essentially it's a REPL (Read, Execute, Print, Loop) using the Execute statement: Do While True WScript.StdOut.Write(">>> ") line = Trim(WScript.StdIn.ReadLine) If LCase(line) = "exit" Then Exit Do On Error Resume Next Execute line If Err.Number <> 0 Then

When implementing the interpreter for my programming language I first thought of a simple console window which allows the user to enter some code which is then executed as a standalone program as a shell. But there are severe problems: If every line of code the user enters is handled as a standalone program, it has to go through the tokenizer and parser and is then just executed by the interpreter - what about functions then? How can the Python/Ruby interactive consoles (IDLE, irb) "share" the code? How is the code entered handled? Example: >> def x: >> print("Blah") >> >> x() Where is the

I'm prompting questions in a bash script like this: optionsAudits=("Yep" "Nope") echo "Include audits?" select opt in "${optionsAudits[@]}"; do case $REPLY in 1) includeAudits=true; break ;; 2) includeAudits=false; break ;; "\n") echo "You pressed enter"; break ;; # <--- doesn't work *) echo "What's that?"; exit;; esac done How can I select a default option when enter is pressed? The "\n" case does not catch the enter key. mklement0 To complement Aserre's helpful answer , which explains the problem with your code and offers an effective workaround, with background information and a generic,

I`m trying to use fabric to install and deploy a web project during which I need to create a postgresql database and configure a RabbitMQ server. Both these operations are interactive and requires input from the user for creating a database, adding a user, setting password etc ( at least to my knowledge ). Can I use a fabric script to do interative shell operations like these? This is in Fabric 1.0. I've tried it and it works for me. Older versions of Fabric (and similar high level SSH libraries) run remote programs in limbo, unable to be touched from the local end. This is problematic when

In my case, I want to remove one of the circle when clicking reset button. However, ax.clear() would clear all circles on the current figure. Can someone tell me how to remove only part of the patches? import matplotlib.patches as patches import matplotlib.pyplot as plt from matplotlib.widgets import Button fig = plt.figure() ax = fig.add_subplot(111) circle1 = patches.Circle((0.3, 0.3), 0.03, fc='r', alpha=0.5) circle2 = patches.Circle((0.4, 0.3), 0.03, fc='r', alpha=0.5) button = Button(plt.axes([0.8, 0.025, 0.1, 0.04]), 'Reset', color='g', hovercolor='0.975') ax.add_patch(circle1) ax.add