03-09-2013
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 CENTOS
systemd-suspend.service
SYSTEMD-SUSPEND.SERVICE(8) systemd-suspend.service SYSTEMD-SUSPEND.SERVICE(8)
NAME
systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-sleep.service, systemd-sleep - System sleep state logic
SYNOPSIS
systemd-suspend.service
systemd-hibernate.service
systemd-hybrid-sleep.service
/usr/lib/systemd/systemd-sleep
DESCRIPTION
systemd-suspend.service is a system service that is pulled in by suspend.target and is responsible for the actual system suspend.
Similarly, systemd-hibernate.service is pulled in by hibernate.target to execute the actual hibernation. Finally,
systemd-hybrid-sleep.service is pulled in by hybrid-sleep.target to execute hybrid hibernation with system suspend.
Immediately before entering system suspend and/or hibernation systemd-suspend.service (and the other mentioned units, respectively) will
run all executables in /usr/lib/systemd/system-sleep/ and pass two arguments to them. The first argument will be "pre", the second either
"suspend", "hibernate", or "hybrid-sleep" depending on the chosen action. Immediately after leaving system suspend and/or hibernation the
same executables are run, but the first argument is now "post". All executables in this directory are executed in parallel, and execution
of the action is not continued until all executables have finished.
Note that scripts or binaries dropped in /usr/lib/systemd/system-sleep/ are intended for local use only and should be considered hacks. If
applications want to be notified of system suspend/hibernation and resume, there are much nicer interfaces available.
Note that systemd-suspend.service, systemd-hibernate.service, and systemd-hybrid-sleep.service should never be executed directly. Instead,
trigger system sleep states with a command such as "systemctl suspend" or similar.
Internally, this service will echo a string like "mem" into /sys/power/state, to trigger the actual system suspend. What exactly is written
where can be configured in the "[Sleep]" section of /etc/systemd/sleep.conf. See systemd-sleep.conf(5).
OPTIONS
systemd-sleep understands the following commands:
-h, --help
Print a short help text and exit.
--version
Print the systemd version identifier and exit.
suspend, hibernate, hybrid-sleep
Suspend, hibernate, or put the system to hybrid sleep.
SEE ALSO
systemd-sleep.conf(5), systemd(1), systemctl(1), systemd.special(7), systemd-halt.service(8)
systemd 208 SYSTEMD-SUSPEND.SERVICE(8)