RHCE Scripting and Task Scheduling

Question 1

Which shebang line is correct for a bash script on RHEL?

Accepted Answer

#!/bin/bash

Answer

#/bin/bash

Answer

# !/usr/bin/bash

Answer

//bin/bash

Question 2

What does the `$?` variable represent in a bash script?

Accepted Answer

Exit code of the last command

Answer

Current script's PID

Answer

Number of arguments passed

Answer

Current user's UID

Question 3

Which `cron` field position represents 'day of the week'?

Accepted Answer

5th field

Answer

4th field

Answer

3rd field

Answer

6th field

Question 4

What command lists all cron jobs for the current user?

Accepted Answer

crontab -l

Answer

crontab -e

Answer

cron -list

Answer

cat /etc/crontab

Question 5

Which special cron string runs a job every day at midnight?

Accepted Answer

All of the above

Answer

@midnight

Answer

@daily

Answer

0 0 * * *

Question 6

What is the purpose of `systemd.timer` units in RHEL?

Accepted Answer

Schedule tasks as a modern cron replacement using systemd

Answer

Set system clock time zones

Answer

Manage service startup delays

Answer

Track service uptime