cat command

I‘m using the ldd command to get information about /usr/local/nginx/sbin/nginx binary and I see linux-gate.so.1 library. However, I’m unable to find out this file anywhere on the system? What is linux-gate.so.1 and how do I copy this file?

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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 use cat command in Linux? How do I use cat command in UNIX? How can I use cat command in UNIX or Linux shell scripts?

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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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How do I combine all text files in a directory into a single file and ftp that file to another server?

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Q. Physical Address Extension (PAE) refers to a feature of x86 and x86-64 processors that allows more than 4G bytes of physical memory to be used in 32-bit systems. The x86 architecture presently uses only 36 bits out of 52 bits possible. On x86-64 processors, PAE is obligatory in native long mode; currently 40 bits are used out of 52 bits possible. How do I find out if my Linux kernel supports 36-bit or more physical addressing?

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