I am a new Linux and Unix system user. How do I use cat command on Linux or Unix-like operating systems? Can you provide basic examples and syntax usage for cat command?
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I have multiple version of gcc installed on my Linux based system as follows:

ls -l /usr/bin/gcc*
lrwxrwxrwx 1 root root 7 Jan 11 05:20 /usr/bin/gcc -> gcc-4.4
-rwxr-xr-x 1 root root 239528 Sep 21 2010 /usr/bin/gcc-4.3
-rwxr-xr-x 1 root root 255536 Nov 15 2010 /usr/bin/gcc-4.4

I need to build a nvidia device driver using the same version of GNU compiler as was used to compile the currently running kernel. How do I find out the version of my GNU gcc compiler that was used by upstream Linux distribution to compile and pack my binary Linux kernel?
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How do I find out my RHEL (Red Hat Enterprise Linux) 6 Linux kernel version number running on HP server? How can I get RHEL 6 kernel version? How do you find out a CentOS 6 kernel version using the CLI?

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I‘m running RHEL on HP server. This server allows to login to reset of the LAN from the Internet. How do I find out failed login records under Linux operating systems?
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How do I display or show a list of all hard disk drive partitions under Linux operating systems?
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What command I need to type to display Linux kernel version and other information such as Linux distribution name? How do I check Linux kernel version number?
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