How to return pid of a last command in Linux / Unix

I need to find and return pid of a last command execute in Linux. How do I return pid of a command in Linux?
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Debian Linux 10.2 released and here is how to upgrade it

The Debian GNU/Linux project has released an updated version of its stable Linux distribution Debian 10 (“buster”). You must upgrade to get corrections for security problem as this version made a few adjustments for the severe issue found in Debian version 10.1. Debian is a Unix-like (Linux distro) operating system and a distribution of Free Software. It is mainly maintained and updated through the work of many users who volunteer their time and effort. The Debian Project was first announced in 1993 by Ian Murdock.
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Bash get filename from given path on Linux or Unix

How do I extract filename and extension in the Bash shell script from the given path? How can I get filename from the path under the bash shell?
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bash: file: command not found. How to install file

I am running file /usr/sbin/arp command on a Debian VM minimal but getting an error that read as:bash: file: command not foundHow do I fix this error on a Debian or Ubuntu Linux system? How can I install file command on Linux cloud?
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How to find fan speed in Linux for CPU and GPU

What commands I need to type to find out fan speed for GPU and CPU in Linux?
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How to find a website’s DNS (name server) address

How can I find a website’s DNS address? How do I check the current DNS servers of a domain or website using a Linux or macOS command line option? How do I find DNS address of a website using bash?
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Delta RPMs disabled because applydeltarpm not installed

I getting the following warning on both CentOS 7 and RHEL (Red Hat) 7 when I run yum command:Delta RPMs disabled because /usr/bin/applydeltarpm not installed.What is delta RPM (DRPM) and how does it differ from RPM? How do I fix this issue on a CentOS or RHEL 7 server/desktop?
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How to find Public IP address AWS EC2 or Lightsail VM

I need to get public IPv4 address on current EC2 or Lightsail VM Linux/Unix instance. How do I find Public IP address AWS EC2 or Lightsail VM?
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Ubuntu Linux 19.10 released: New Features and Download

Ubuntu Linux 19.10 released and will be supported for nine months till July 2020. It is codenamed as Eoan Ermine. The newer release comes with updated Linux kernel 5.3.x, NVIDIA drivers for gaming or AI programming, ZFS on root, OpenStack Train, and more. Let us see what’s new in Ubuntu 19.10 and how to upgrade 19.04 to 19.10 using the command-line options.
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Amazon Linux AMI Install Linux, nginx, MySQL, PHP (LEMP)

How do I install Linux, nginx, MySQL, PHP (LEMP) stack on Amazon Linux AMI running on AWS?
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