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Linux / Unix: Find Out DNS Server IP Address / Names

I‘m writing a bash wrapper script that will pass arguments to the command. I need to find out the last argument if I call the wrapper as follows:

./wrapper -a -b –longarg=foo thisfilename.txt
./wrapper -a -b thisfilename.txt
./wrapper -a –next=true thisfilename.txt

Where,
=> $@ is all of them.
=> $0 is script name.
=> $1 is first arg.

I want thisfilename.txt stored in a shell variable called $last. How do I find the last argument passed to a shell script written in bash or ksh under Unix like operating systems?
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Unix Copy Command Examples [ cp command ]

How do I copy files under Unix operating system using ksh or csh or bash shell prompt?
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HowTo: Open a Tar.gz File In Linux / Unix

I‘ve received a file called date.tar.gz. How do I open/extract/unpack a tar.gz file on Linux or Unix like operating systems using shell prompt?
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Apple OS X: Remove a Symbolic Link (Symlink) Command

How do I remove a symlink under Apple Mac OS X using bash command line option?
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Unix / Linux Shell: Get Third Field Separated by Forward Slash (/) Delimiter

I‘m writing a shell script for automation purpose. The output the path of the current working directory is stored in $PWD or it can be obtained using the pwd command. How do I find out find out 3rd field separated by the forward slash (/) delimiter using $PWD under Unix like operating systems?
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HowTo: Find Out DNS Server IP Address Used By My Router?

My router configured by ISP tech and it is set to get DNS server address automatically from upstream. Is there is a way to find out the IP address of the dns server used by my router which is located at 192.168.1.1? Is there Linux, Unix, Apple OS X, or MS-Windows command that I can use get the same information?
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How To Set Readonly File Permissions On Linux / Unix Web Server DocumentRoot

How do I set a read-only permission for all of my files stored in /var/www/html/ directory?
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Linux / Unix: Show Shares on NFS Server [ Shared Directories ]

We have a few netapp and other Unix server running here. An NFS server is configured on both netapp and Unix. How do I see all exported file systems from netapp and unix server using Linux command line option?
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