According to Omniglot, there are several ways to say hello in Egyptian Arabic, including "ahlan wa sahlan" or just "ahlan." The Islamic greeting "is sal?m 'alaykum" is also an acceptable manner of saying hello in Egypt.
If one wants to ask how someone is in Egyptian Arabic, one would say "izayyak" to males and "izayyik" to females. There is no separate Egyptian language, only a dialect differing from other Arabic dialects. According to eArabicLearning, the Egyptian dialect is the most widely spoken dialect of Arabic in the world. The dialect is known as "al'amiah," "al logah al masriah al'amiah," or simply as "masri."