Lpi 102-500 問題集

質問 1：
Which of the following parameters are used for journalctl to limit the time frame of the output? (Choose TWO correct answers.)
A. --until=
B. --upto=
C. --since=
D. --date=
E. --from=
正解：A,C
解説: (Topexam メンバーにのみ表示されます)

質問 2：
Which crontab entry could be used to set the system time at regular intervals?
A. 1 0 * * * date $d $t $24
B. 1 0 * * * ntpdate ntp1.digex.net
C. 1 0 * * * runcron date ntp1.digex.net
D. 1 0 * * * date ntp1.digex.net
E. 1 0 * * * settime $d $t $24
正解：B
解説: (Topexam メンバーにのみ表示されます)

質問 3：
Which of the following configuration files should be modified to set default shell variables for all users?
A. ~/.bash_profile
B. /etc/.bashrc
C. /etc/profile
D. /etc/bashrc
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 4：
What is the main difference between the batch and at commands?
A. The at command reads commands from standard input. The batch command requires a command line argument.
B. The batch command will run when system load is low. The at command runs at a specific time.
C. The batch command will run multiple times.The at command will only run once.
D. The at command e-mails results to the user. The batch command logs results to syslog.
正解：B
解説: (Topexam メンバーにのみ表示されます)

質問 5：
Which of the following commands can be used to limit the amount of memory a user may use?
A. ulimit
B. chage
C. umask
D. passwd
E. usermod
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 6：
What command can be used to generate syslog entries of any facility and priority? (supply just the command name without a path)
正解：
logger
Explanation:
The logger command can be used to generate syslog entries of any facility and priority. It is a shell command interface to the syslog system log module. It allows users to write messages to the system log from the command line or from a script. The logger command supports several options to specify the facility, priority, tag, message, and other attributes of the log entry. For example, the following command generates a log entry with the facility user and the priority info:
logger -p user.info "This is a test message"
The facility and priority can be any of the values defined in the syslog protocol, such as kern, mail, auth, local0, etc. for the facility, and emerg, alert, crit, err, warn, notice, info, debug, etc. for the priority. The default facility is user and the default priority is notice. The logger command can also read messages from standard input or from a file. For more information, see the logger man page or the logger - Linux man page online.
References:
* Syslogs in Linux: Understanding Facilities and Levels
* What are Syslog Facilities and Levels? - Trend Micro
* syslog-ng Open Source Edition 3.30 - Administration Guide
* Syslog Logging Guide: Advanced Concepts - CrowdStrike