I am a new Linux system user. How do I check os version in linux command line?
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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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I am a new Linux system user and MS-Windows XP refugees. How do I check Linux kernel version using a shell prompt?
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I am a new Ubuntu Linux user and purchased a laptop from Dell with per-installed Ubuntu operating systems. How do I find the Linux kernel version and Ubuntu release version using the terminal application?
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I am a new Linux system user and developer. What version of Linux do I have? What’s my OS and How do I find out from the command line? How do I check Linux version from the GUI or the CLI?
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How do I find out my Linux kernel version? How can I find the kernel version at shell prompt on Linux?
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