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Question		Answer
What manages services in RHEL 7? start learning		systemd
Can systemd start multiple services in the same time? start learning		yes
List available targets in the system start learning		systemctl list-units --type=target
List available unit types start learning		systemctl -t help
Unique configuration files are located in? start learning		/etc/systemd/system
Display current target start learning		systemctl get-default
What are the targets in RHEL? start learning		multi-user. target, graphical. target, emergency. target, rescue. target
Display dependencies for multi-user. targer start learning		systemctl list-dependencies multi-user. target
How to change target to different target? start learning		systemctl isolate multi-user. target
How to set default target? start learning		systemctl set-default
Where are all unit configuration files? start learning		/usr/lib/system
Where are all unit configuration files for downloaded and installed programs? start learning		/etc/systemd/system
How to boot a system into different target? start learning		Interrupt booting with e, go to linux16, add systemd. unit=emergency. target at the end, ctrl+x
How to list all jobs working in the background? start learning		root#jobs
How to stop program with id 1 start learning		kill -SIGSTOP %1
How to resume previously stopped program? start learning		kill -sigcont %1
What is the most prioritized level? start learning		-20
What is the least priorizted level? start learning		19
How to create 1G file with dd command? start learning		dd if=/dev/zero/ of=/root/test. file bs=1M count=1024
How to check runing services and their nice level? start learning		ps axo pid, comm, nice \| grep <nazwa serwisu>
How to start httpd service with priority 0, previously must be stopped start learning		nice -n 0 httpd

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