On Linux Systems, Numerous Users Often Come Across a Program Or Process That Locks Up
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Shutdown Script for Retropie
Shutdown Script for Retropie Use pin number 5 & 14 for “Shutdown” 1. Update RetroPie: • sudo apt-get update 2. Upgrade RetroPie • sudo apt-get upgrade 3. Install Python • sudo apt-get install python-dev • sudo apt-get install python3-dev • sudo apt-get install gcc • sudo apt-get install python-pip 4. Next you need to get RPi.GPIO: • wget https://pypi.python.org/packages/source/R/RPi.GPIO/RPi.GPIO-0.5.11.tar.gz 5. Extract the packages: • sudo tar -zxvf RPi.GPIO-0.5.11.tar.gz 6. Move into the newly created directory: • cd RPi.GPIO-0.5.11 • 7. Install the module by doing: • sudo python setup.py install • sudo python3 setup.py install 8. Creating a directory to hold your scripts: • mkdir /home/pi/scripts 9. Call our script shutdown.py (it is written in python). Create and edit the script by doing: • sudo nano /home/pi/scripts/shutdown.py The content of the script: Paste it in the blank area #!/usr/bin/python import RPi.GPIO as GPIO import time import subprocess # we will use the pin numbering to match the pins on the Pi, instead of the # GPIO pin outs (makes it easier to keep track of things) GPIO.setmode(GPIO.BOARD) # use the same pin that is used for the reset button (one button to rule them all!) GPIO.setup(5, GPIO.IN, pull_up_down = GPIO.PUD_UP) oldButtonState1 = True while True: #grab the current button state buttonState1 = GPIO.input(5) # check to see if button has been pushed if buttonState1 != oldButtonState1 and buttonState1 == False: subprocess.call("shutdown -h now", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE) oldButtonState1 = buttonState1 time.sleep(.1) Press CRTL X Then Y and Enter 10. -
Autocad Command Aliases
AutoCAD and Its Applications Advanced Appendix D AutoCAD Command Aliases Command Alias 3DALIGN 3AL 3DFACE 3F 3DMOVE 3M 3DORBIT 3DO, ORBIT, 3DVIEW, ISOMETRICVIEW 3DPOLY 3P 3DPRINT 3DP, 3DPLOT, RAPIDPROTOTYPE 3DROTATE 3R 3DSCALE 3S 3DWALK 3DNAVIGATE, 3DW ACTRECORD ARR ACTSTOP ARS -ACTSTOP -ARS ACTUSERINPUT ARU ACTUSERMESSAGE ARM -ACTUSERMESSAGE -ARM ADCENTER ADC, DC, DCENTER ALIGN AL ALLPLAY APLAY ANALYSISCURVATURE CURVATUREANALYSIS ANALYSISZEBRA ZEBRA APPLOAD AP ARC A AREA AA ARRAY AR -ARRAY -AR ATTDEF ATT -ATTDEF -ATT Copyright Goodheart-Willcox Co., Inc. Appendix D — AutoCAD Command Aliases 1 May not be reproduced or posted to a publicly accessible website. Command Alias ATTEDIT ATE -ATTEDIT -ATE, ATTE ATTIPEDIT ATI BACTION AC BCLOSE BC BCPARAMETER CPARAM BEDIT BE BLOCK B -BLOCK -B BOUNDARY BO -BOUNDARY -BO BPARAMETER PARAM BREAK BR BSAVE BS BVSTATE BVS CAMERA CAM CHAMFER CHA CHANGE -CH CHECKSTANDARDS CHK CIRCLE C COLOR COL, COLOUR COMMANDLINE CLI CONSTRAINTBAR CBAR CONSTRAINTSETTINGS CSETTINGS COPY CO, CP CTABLESTYLE CT CVADD INSERTCONTROLPOINT CVHIDE POINTOFF CVREBUILD REBUILD CVREMOVE REMOVECONTROLPOINT CVSHOW POINTON Copyright Goodheart-Willcox Co., Inc. Appendix D — AutoCAD Command Aliases 2 May not be reproduced or posted to a publicly accessible website. Command Alias CYLINDER CYL DATAEXTRACTION DX DATALINK DL DATALINKUPDATE DLU DBCONNECT DBC, DATABASE, DATASOURCE DDGRIPS GR DELCONSTRAINT DELCON DIMALIGNED DAL, DIMALI DIMANGULAR DAN, DIMANG DIMARC DAR DIMBASELINE DBA, DIMBASE DIMCENTER DCE DIMCONSTRAINT DCON DIMCONTINUE DCO, DIMCONT DIMDIAMETER DDI, DIMDIA DIMDISASSOCIATE DDA DIMEDIT DED, DIMED DIMJOGGED DJO, JOG DIMJOGLINE DJL DIMLINEAR DIMLIN, DLI DIMORDINATE DOR, DIMORD DIMOVERRIDE DOV, DIMOVER DIMRADIUS DIMRAD, DRA DIMREASSOCIATE DRE DIMSTYLE D, DIMSTY, DST DIMTEDIT DIMTED DIST DI, LENGTH DIVIDE DIV DONUT DO DRAWINGRECOVERY DRM DRAWORDER DR Copyright Goodheart-Willcox Co., Inc. -
Adding a Shutdown Button to the Raspberry Pi B+ Version 1
Welcome, Guest Log in Register Activity Translate Content Search within content, members or groups Search Topics Resources Members Design Center Store All Places > Raspberry Pi > Raspberry Pi Projects > Documents Adding a Shutdown Button to the Raspberry Pi B+ Version 1 Created by ipv1 on Aug 4, 2015 3:05 AM. Last modified by ipv1 on Aug 18, 2015 9:52 AM. Introduction What do you need? Step 1. Setup the RPi Step 2. Connecting the button Step 3. Writing a Python Script Step 4. Adding it to startup Step 5. More to do Introduction For a beginner to the world of raspberry pi, there are a number of projects that can become the start of something big. In this article, I discuss such a simple project which is adding a button that can be used to shutdown the raspberry pi using a bit of software tinkering. I wrote a similar article in 2013 at my blog “embeddedcode.wordpress.com” and its got its share of attention since a lot of people starting out with a single board computer, kept looking for a power button. Additionally, those who wanted a headless system, needed a way to shutdown the computer without the mess of connecting to it over the network or attaching a monitor and keyboard to it. In this article, I revisit the tutorial on how to add a shutdown button while trying to explain the workings and perhaps beginners will find it an amusing to add find more things to do with this little recipe. What do you need? Here is a basic bill of materials required for this exercise. -
CS101 Lecture 9
How do you copy/move/rename/remove files? How do you create a directory ? What is redirection and piping? Readings: See CCSO’s Unix pages and 9-2 cp option file1 file2 First Version cp file1 file2 file3 … dirname Second Version This is one version of the cp command. file2 is created and the contents of file1 are copied into file2. If file2 already exits, it This version copies the files file1, file2, file3,… into the directory will be replaced with a new one. dirname. where option is -i Protects you from overwriting an existing file by asking you for a yes or no before it copies a file with an existing name. -r Can be used to copy directories and all their contents into a new directory 9-3 9-4 cs101 jsmith cs101 jsmith pwd data data mp1 pwd mp1 {FILES: mp1_data.m, mp1.m } {FILES: mp1_data.m, mp1.m } Copy the file named mp1_data.m from the cs101/data Copy the file named mp1_data.m from the cs101/data directory into the pwd. directory into the mp1 directory. > cp ~cs101/data/mp1_data.m . > cp ~cs101/data/mp1_data.m mp1 The (.) dot means “here”, that is, your pwd. 9-5 The (.) dot means “here”, that is, your pwd. 9-6 Example: To create a new directory named “temp” and to copy mv option file1 file2 First Version the contents of an existing directory named mp1 into temp, This is one version of the mv command. file1 is renamed file2. where option is -i Protects you from overwriting an existing file by asking you > cp -r mp1 temp for a yes or no before it copies a file with an existing name. -
Systems Programming II
Systems Programming II Iqbal Mohomed CSC 209 – Summer 2004 Week 7 Motivation for Signals • When a program forks into 2 or more processes, rarely do they execute independently of each other • The processes usually require some form of synchronization, and this is typically handled using signals. Job control is another important use • Data usually needs to be passed between processes also, and this is typically handled using pipes and sockets, which we will discuss shortly • Signals are usually generated by – Machine interrupts – The program itself, other programs, or the user (i.e. from the keyboard) Introduction to Signals • When a C program receives a signal, control is immediately passed to a function called a signal handler • The signal handler function can execute some C statements and exit in three different ways: – Return control to the place in the program which was executing when the signal occurred – Return control to some other point in the program – Terminate the program by calling the exit (or _exit) function signal() • A default action is provided for each kind of signal, such as terminate, stop or ignore • For nearly all signal types, the default action can be changed using the signal() function. The exceptions are SIGKILL and SIGSTOP. The handler is defined as follows: – typedef void (*sighandler_t)(int); • To change the handler: – sighandler_t signal(int signum, sighandler_t handler); More on signal() • For each process, the OS maintains a table of actions that should be performed for each kind of signal. The signal() function changes the table entry for the signal named as the first argument to the value provided as the second argument. -
Shutdown Policies with Power Capping for Large Scale Computing Systems Anne Benoit, Laurent Lefèvre, Anne-Cécile Orgerie, Issam Raïs
Shutdown Policies with Power Capping for Large Scale Computing Systems Anne Benoit, Laurent Lefèvre, Anne-Cécile Orgerie, Issam Raïs To cite this version: Anne Benoit, Laurent Lefèvre, Anne-Cécile Orgerie, Issam Raïs. Shutdown Policies with Power Capping for Large Scale Computing Systems. Euro-Par: International European Conference on Parallel and Distributed Computing, Aug 2017, Santiago de Compostela, Spain. pp.134 - 146, 10.1109/COMST.2016.2545109. hal-01589555 HAL Id: hal-01589555 https://hal.archives-ouvertes.fr/hal-01589555 Submitted on 18 Sep 2017 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Shutdown policies with power capping for large scale computing systems Anne Benoit1, Laurent Lef`evre1, Anne-C´ecileOrgerie2, and Issam Ra¨ıs1 1 Univ. Lyon, Inria, CNRS, ENS de Lyon, Univ. Claude-Bernard Lyon 1, LIP 2 CNRS, IRISA, Rennes, France Abstract Large scale distributed systems are expected to consume huge amounts of energy. To solve this issue, shutdown policies constitute an appealing approach able to dynamically adapt the resource set to the actual workload. However, multiple constraints have to be taken into account for such policies to be applied on real infrastructures, in partic- ular the time and energy cost of shutting down and waking up nodes, and power capping to avoid disruption of the system. -
Beginning Portable Shell Scripting from Novice to Professional
Beginning Portable Shell Scripting From Novice to Professional Peter Seebach 10436fmfinal 1 10/23/08 10:40:24 PM Beginning Portable Shell Scripting: From Novice to Professional Copyright © 2008 by Peter Seebach All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage or retrieval system, without the prior written permission of the copyright owner and the publisher. ISBN-13 (pbk): 978-1-4302-1043-6 ISBN-10 (pbk): 1-4302-1043-5 ISBN-13 (electronic): 978-1-4302-1044-3 ISBN-10 (electronic): 1-4302-1044-3 Printed and bound in the United States of America 9 8 7 6 5 4 3 2 1 Trademarked names may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, we use the names only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. Lead Editor: Frank Pohlmann Technical Reviewer: Gary V. Vaughan Editorial Board: Clay Andres, Steve Anglin, Ewan Buckingham, Tony Campbell, Gary Cornell, Jonathan Gennick, Michelle Lowman, Matthew Moodie, Jeffrey Pepper, Frank Pohlmann, Ben Renow-Clarke, Dominic Shakeshaft, Matt Wade, Tom Welsh Project Manager: Richard Dal Porto Copy Editor: Kim Benbow Associate Production Director: Kari Brooks-Copony Production Editor: Katie Stence Compositor: Linda Weidemann, Wolf Creek Press Proofreader: Dan Shaw Indexer: Broccoli Information Management Cover Designer: Kurt Krames Manufacturing Director: Tom Debolski Distributed to the book trade worldwide by Springer-Verlag New York, Inc., 233 Spring Street, 6th Floor, New York, NY 10013. -
Unix/Linux Command Reference
Unix/Linux Command Reference .com File Commands System Info ls – directory listing date – show the current date and time ls -al – formatted listing with hidden files cal – show this month's calendar cd dir - change directory to dir uptime – show current uptime cd – change to home w – display who is online pwd – show current directory whoami – who you are logged in as mkdir dir – create a directory dir finger user – display information about user rm file – delete file uname -a – show kernel information rm -r dir – delete directory dir cat /proc/cpuinfo – cpu information rm -f file – force remove file cat /proc/meminfo – memory information rm -rf dir – force remove directory dir * man command – show the manual for command cp file1 file2 – copy file1 to file2 df – show disk usage cp -r dir1 dir2 – copy dir1 to dir2; create dir2 if it du – show directory space usage doesn't exist free – show memory and swap usage mv file1 file2 – rename or move file1 to file2 whereis app – show possible locations of app if file2 is an existing directory, moves file1 into which app – show which app will be run by default directory file2 ln -s file link – create symbolic link link to file Compression touch file – create or update file tar cf file.tar files – create a tar named cat > file – places standard input into file file.tar containing files more file – output the contents of file tar xf file.tar – extract the files from file.tar head file – output the first 10 lines of file tar czf file.tar.gz files – create a tar with tail file – output the last 10 lines -
Unix System Programming Overview Outline What Is a Signal? Signal
Overview Last Week: ● How to program UNIX processes (Chapters 7-9) ● fork() and exec() Unix System Programming This Week, and next week: ● UNIX inter-process communication mechanisms: signals, Signals » (next week) pipes and FIFOs. ● How to program with UNIX signals (Chapter 10) » http://en.wikipedia.org/wiki/Unix_signal ● Non-local jumps (Chapter 7) ● Focus on the sigaction() function Maria Hybinette, UGA 1 Maria Hybinette, UGA 2 Outline What is a Signal? ● A signal is an asynchronous event which is ● What is a UNIX signal? delivered to a process (instantiated by a small message) ● Signal types ● Asynchronous means that the event can occur ● Generating signals at any time (e.g., posting at a bulletin board ) ● Responding to a signal » may be unrelated to the execution of the process ● Common uses of a signal – e.g., user types Ctrl-C, or the modem hangs (SIGINT) ● Implementing a read() time-out – e.g,, user types Ctrl-Z (SIGTSTP) ● Sent from kernel (e.g. detects divide by zero ● Non-local jumps setjmp()/longjmp() (SIGFPE) or could be at the request of another ● POSIX signals process to send to another) ● Interrupted system calls ● Only information that a signal carries is its ● System calls inside handlers unique ID and that it arrived Maria Hybinette, UGA 3 Maria Hybinette, UGA 4 Signal Types (31 in POSIX) Signal Sources terminal memory ID Name Description Default Action driver management shell command 2 SIGINT Interrupt from keyboard (^C) terminate Ctr-C SIGINT SIGHUP 3 SIGQUIT Quit from keyboard (^\) terminate & core SIGSEGV 9 SIGKILL -
POSIX Signals
CSE 410: Systems Programming POSIX Signals Ethan Blanton Department of Computer Science and Engineering University at Buffalo Introduction Signals Blocking Concurrency Sending Signals Summary References POSIX Signals POSIX signals are another form of interprocess communication. They are also a way to create concurrency in programs. For these two reasons, they are rather complicated and subtle! Signals provide a simple message passing mechanism. © 2018 Ethan Blanton / CSE 410: Systems Programming Introduction Signals Blocking Concurrency Sending Signals Summary References Signals as Messages POSIX signals are asynchronous messages. Asynchronous means that their reception can occur at any time.1 The message is the reception of the signal itself. Each signal has a number, which is a small integer. POSIX signals carry no other data. 1Almost. We’ll see how to control it later. © 2018 Ethan Blanton / CSE 410: Systems Programming Introduction Signals Blocking Concurrency Sending Signals Summary References Signal Types There are two basic types of POSIX signals: Reliable signals Real-time signals Real-time signals are much more complicated. In particular, they can carry data. We will discuss only reliable signals in this lecture. © 2018 Ethan Blanton / CSE 410: Systems Programming Introduction Signals Blocking Concurrency Sending Signals Summary References Asynchronous Reception From the point of view of the application: Signals can be blocked or ignored Enabled signals may be received between any two processor instructions A received signal can run a user-defined function called a signal handler This means that enabled signals and program code must very carefully manipulate shared or global data! © 2018 Ethan Blanton / CSE 410: Systems Programming Introduction Signals Blocking Concurrency Sending Signals Summary References Signals POSIX defines a number of signals by name and number. -
Unix/Linux Command Reference
Unix/Linux Command Reference .com File Commands System Info ls – directory listing date – show the current date and time ls -al – formatted listing with hidden files cal – show this month's calendar cd dir - change directory to dir uptime – show current uptime cd – change to home w – display who is online pwd – show current directory whoami – who you are logged in as mkdir dir – create a directory dir finger user – display information about user rm file – delete file uname -a – show kernel information rm -r dir – delete directory dir cat /proc/cpuinfo – cpu information rm -f file – force remove file cat /proc/meminfo – memory information rm -rf dir – force remove directory dir * man command – show the manual for command cp file1 file2 – copy file1 to file2 df – show disk usage cp -r dir1 dir2 – copy dir1 to dir2; create dir2 if it du – show directory space usage doesn't exist free – show memory and swap usage mv file1 file2 – rename or move file1 to file2 whereis app – show possible locations of app if file2 is an existing directory, moves file1 into which app – show which app will be run by default directory file2 ln -s file link – create symbolic link link to file Compression touch file – create or update file tar cf file.tar files – create a tar named cat > file – places standard input into file file.tar containing files more file – output the contents of file tar xf file.tar – extract the files from file.tar head file – output the first 10 lines of file tar czf file.tar.gz files – create a tar with tail file – output the last 10 lines -
The Linux Command Line
The Linux Command Line Fifth Internet Edition William Shotts A LinuxCommand.org Book Copyright ©2008-2019, William E. Shotts, Jr. This work is licensed under the Creative Commons Attribution-Noncommercial-No De- rivative Works 3.0 United States License. To view a copy of this license, visit the link above or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042. A version of this book is also available in printed form, published by No Starch Press. Copies may be purchased wherever fine books are sold. No Starch Press also offers elec- tronic formats for popular e-readers. They can be reached at: https://www.nostarch.com. Linux® is the registered trademark of Linus Torvalds. All other trademarks belong to their respective owners. This book is part of the LinuxCommand.org project, a site for Linux education and advo- cacy devoted to helping users of legacy operating systems migrate into the future. You may contact the LinuxCommand.org project at http://linuxcommand.org. Release History Version Date Description 19.01A January 28, 2019 Fifth Internet Edition (Corrected TOC) 19.01 January 17, 2019 Fifth Internet Edition. 17.10 October 19, 2017 Fourth Internet Edition. 16.07 July 28, 2016 Third Internet Edition. 13.07 July 6, 2013 Second Internet Edition. 09.12 December 14, 2009 First Internet Edition. Table of Contents Introduction....................................................................................................xvi Why Use the Command Line?......................................................................................xvi