dmidecode command

I need to list serial number of Lenovo laptop to check warranty. How do I find a serial number of Lenovo laptop from Linux command line without rebooting and opening BIOS option? How do I find find serial number of Lenovo ThinkPad laptop from the Linux CLI?
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How do I find out the maximum RAM supported by the Dell, HP, IBM, Oracle/Sun or Intel/AMD server on a Linux or Unix-like operating systems without rebooting the server or opening the server case (chassis)? How can I find find out maximum RAM supported by the Server BIOS and motherboard in Linux?
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How do I find out my Dell server/deskop/laptop service tag using the command line option under a RHEL / Fedora / Red Hat / CentOS / Scientific Linux operating systems? How do I determine the serial number of a Dell laptop computer using the Fedora Linux operating system?
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