Unix operating system is written in C language, hence it is more portable than other operating systems, because of this it is most popular all over the world.

UNIX is portable because you can customize or configure it the way you want it and how you will use it.

Most UNIX servers are configured not to use FTP or TELNET for security purposes, and if you use FTP it has limited number of data can be transfered on one transaction hence I preferred using another w...

If you can't get Samba, or you're not the Admin so you can't install it anyway, then use FTP, as it's almost guaranteed to be installed and running on both machines.  The only han...

Using vi editor. Read only files can be opened without any issues

Anything that opens a file, can open a read only file: cat, more, less, awk, pg, et all. The chmod command you put does not make a file read only, it makes it read/write for the user/owner.