Difference between linux and DOS(Windows)

Please note that all the difference between Linux and MS-DOS applies to MS Windows also unless stated otherwise.

Linux is case sensitive, whereas DOS is not.

Linux filename can contain a maximum of 256 letters including special characters, where as DOS can contain only 11 characters (8 for name+3 for extension). Windows is a special case here, it may contain 256 characters.

Shell for linux is bash(Bourne Again SHell)-most of the time and that for DOS is COMMAND.COM. For Windows it is EXPLORER.EXE

Linux supports file system security by default. DOS and Windows 9x does not support file system security. Only Windows NT/2K/XP allows file system security.

Linux is a multi user operating system. DOS is not. Windows is a multi user operating system.

Linux represents all the devices connected to your computer as files. For eg: your monitor is a file. This is not the case for DOS.

Linux supports networking by itself. But DOS does not. Windows also supports networking.

Linux is a multi-tasking OS, whereas DOS is not. Windows is also Multi-tasking.

These are the some of the more pronounced diffrences. More may folllow.
Oops!, I forgot the major diffrence, Linux is free and open source. But for M$ Windows or M$ DOS, you need to spend money.