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kernel drivers

Linux / Unix: SysVinit Services Restart vs Reload vs Condrestart

Can you tell me differences between the following sysvinit /sbin/service command:

service httpd restart

service httpd condrestart

service httpd reload

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I‘m trying to run a command called sensors-detect and I was recommended to use it87.ko Linux kernel driver. But, when I do modprobe it87, I get the following error under Debian Linux

FATAL: Error inserting it87 (/lib/modules/2.6.32-5-686/kernel/drivers/hwmon/it87.ko): Device or resource busy

How do I fix this problem under Debian GNU/Linux 6.x?
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I‘m getting the following error in /var/log/messages file and my sensors command is also not working:


Aug 13 21:22:24 backup kernel: [ 8.681901] ACPI: I/O resource it87 [0x295-0x296] conflicts with ACPI region IP__ [0x295-0x296]
Aug 13 21:22:24 backup kernel: [ 8.683378] it87 it87.656: Detected broken BIOS defaults, disabling PWM interface

How do I fix this problem under Debian or Ubuntu Linux desktop system?
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Linux Disable Wireless Networking ( Wi-Fi )

We have over 20+ Dell Precision M6400 laptops pre installed with Red Hat Enterprise Linux version 5.x. I was asked to disable Wi-Fi on all laptops as it poses a serious security risk to our sensitive (classified) systems and networks. How do I disable wireless networking (802.11) under Linux?
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Linux Disable USB Devices (Disable loading of USB Storage Driver)

In our research lab, would like to disable all USB devices connected to our HP Red Hat Linux based workstations. I would like to disable USB flash or hard drives, which users can use with physical access to a system to quickly copy sensitive data from it. How do I disable USB device support under CentOS Linux, RHEL version 5.x/6.x/7.x and Fedora latest version?
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Linux Load USB Driver

How do I load USB driver under Linux operating system using the command prompt?
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Linux: Find out what kernel drivers (modules) are loaded

How do I find out what Linux kernel drivers are loaded by Linux? How do I list device drivers (or so-called modules) loaded into memory?
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