Processes Lab Post: 302778147

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Homework and Emergencies Homework & Coursework Questions Processes Lab Post 302778147 by Jagst3r21 on Saturday 9th of March 2013 10:18:46 PM

03-09-2013

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Processes Lab

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1. The problem statement, all variables and given/known data:

Here are my directions. I am pretty sure I am doing this right, but I just want someone more experienced to look over my work. Thank you.

There are two parts. It seems long but it's not. For both I need to record my inputs into a script file :

Part 1:

1) Start the command "sleep 6000" in the background
2) Use ps to determine its status
3) Redirect the ps command to a file
4) Kill the sleep process
5) Run ps to verify the process is dead.

Part 2: (Working with multiple processes)

1) Start up "sleep 6000" in the background
2) Start up "sleep 3000" with nohup in the background
3) Bring "sleep 6000" to the foreground
4) Suspend "sleep 6000"
5) Use ps or jobs to verify the state of all processes
6) Send a copy of ps to a file and print it
7) Kill both processes

2. Relevant commands, code, scripts, algorithms:

The relevant commands would be those located under processes, since that is the section we are working on now.

3. The attempts at a solution (include all code and scripts):

First I do "touch lab5file" to create a file, then I do "script lab5" to record my inputs (My teacher wants one script file for both parts - he does not want the output, just commands)

Part 1:

1. sleep 6000 &
2 + 3. ps > /var/home/stud3/jgeiger/lab5file
4. kill -9 <PID number here>
5. ps

Part 2:

1. sleep 6000 &
2. nohup sleep 3000 &
3. fg %<job number for sleep 6000 here>
4. ctrl + z
5 + 6. ps > /var/home/stud3/jgeiger/lab5file
7. kill -9 <PID number for sleep 6000>
8. kill -9 <PID number for sleep 3000>

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

Brookdale Community College - Lincroft, New Jersey - United States - Dr. Rick Bournique- COMP 145

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).

Last edited by Jagst3r21; 03-09-2013 at 11:26 PM.. Reason: course link

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LEARN ABOUT OSF1

sleep

sleep(3)						     Library Functions Manual							  sleep(3)

NAME

       sleep - Suspends execution for an interval of time

LIBRARY

       Standard C Library (libc.a) Threads Library (libpthreads.a)

SYNOPSIS

       #include <unistd.h>

       unsigned int sleep (	 unsigned int seconds );

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       sleep():  XPG4, XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies the number of seconds to sleep.

DESCRIPTION

       The  sleep()  function  suspends  execution  of	a process for the interval specified by the seconds parameter.	The suspension time may be
       longer than requested due to the scheduling of other activity by the system.

       In a multi-threaded environment, the sleep() function is redefined so that only the calling thread is suspended.

RETURN VALUES

       If the sleep() function returns because the requested time has elapsed, it returns 0 (zero).  If the sleep() function  returns  because	it
       caught a  signal, the function returns the number of seconds remaining in the suspension.

RELATED INFORMATION

       Commands: wall(1), shutdown(8) sleep(1)

       Functions: sigaction(2), alarm(3), pause(3)

       Standards: standards(5) delim off

																	  sleep(3)