LFCS Certification Process and Job Scheduling 5

Question 1

Which systemd command would you use to view the full journal logs for a specific service unit?

Accepted Answer

journalctl -u servicename.service

Answer

`journalctl -u unitname` filters the journal to show only log entries from the specified systemd unit.

Question 2

What is a process group in Linux?

Accepted Answer

A collection of related processes sharing a common PGID, used for signal delivery

Answer

A process group is a set of processes with the same PGID (process group ID), allowing signals to be sent to all members at once.

Question 3

When using `fg` in bash, what does it do?

Accepted Answer

Brings a background or stopped job into the foreground

Answer

`fg [%jobnumber]` resumes a background or suspended job and runs it in the foreground of the current shell.

Question 4

What does the `ulimit -n` command configure for a shell session?

Accepted Answer

The maximum number of open file descriptors

Answer

`ulimit -n` sets or displays the maximum number of open file descriptors allowed for the current shell and its child processes.

Question 5

Which file in /etc controls the default system-wide nice value limit for users?

Accepted Answer

/etc/security/limits.conf

Answer

`/etc/security/limits.conf` defines resource limits including `priority` (nice value) for users and groups system-wide.

LFCS Certification Practice Test