Which TWO statements about crontab are true?

Which of the following commands should be used in a bash script that needs a variable containing the IP address of the eth0 interface? The output for the command ifconfig eth0 is shown below:
eth0 Link encap:Ethemet HWaddr 00:0C:29:CB:FA:30
inet addr:192.168.246.11 Bcast:192.168.246.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4721 errors:0 dropped:0 overruns:0 frame:0
TX packets:3216 errors:0 dropped:0 overruns:0 carrier:0
Collisions:0 txqueuelen:1000
RX bytes:455184 (434.7 Kb) TX bytes:512968 (500.9 Kb)
Interrupt:185 Base address:0x1080

Which THREE statements concerning automounter are true?

The swap usage on a system needs to be checked. Which TWO commands can be used to display a swap usage summary?

What command is used to force a file-system check, when rebooting?

A system is running out of swap space. To initialise 5GB of additional swap space, which combination of commands should be used?

What command can be used on an existing (formatted) partition, to configure the interval between disk checks when mounting partitions?

Hundreds of people log in to a server from remote locations per day. Which of the following commands show remote SSH, FTP & telnet sessions for a particular day?

Which of the following must be included in the syslogd configuration file, so that ONLY kernel related messages with the priority crit are reported?

When building an RPM package, which rpmbuild option is used to unpack sources and apply patches before proceeding with the next steps?