He has worked side by side with other comedians like Asrani, Shakti Kapoor and Johnny Lever. Bapaiah, Narayana Rao Dasari, David Dhawan. He was most popularly recognized for working with actors Amitabh Bachchan, Rajesh Khanna, Jeetendra, Feroz Khan, Mithun Chakraborty, Anil Kapoor, Govinda and in films directed by Tatineni Rama Rao, K. At the insistence of Rajesh Khanna, Manmohan Desai paid him the high amount of one lakh twenty-one thousand (121,000) for writing dialogue for the film Roti (1974), which was produced by Khanna himself. Khan acted in over 300 films in Hindi and Urdu and wrote dialogue for over 250 Indian films, from the 1970s up to the turn of the 21st century.

His career as a Hindi film writer began when Narinder Bedi saw the theatre play Khan had written and asked him to co-write the script for Jawani Diwani with Inder Raj Anand, for which Khan received 1500 rupees. He used to write plays for theatres and was subsequently offered to write the script of Jawani Diwani, which started his career as a script writer. During an interview to Rediff, Khan recalled this as the incident that started his film career. Dilip Kumar was impressed and signed him up for his next films, Sagina and Bairaag. While performing in a play named Taash Ke Patey, he was noted by comedian Agha who then suggested actor Dilip Kumar to see the play. Saboo Siddik College of Engineering in Byculla as a professor of civil engineering.

He enrolled in a local municipal school and later in the Ismail Yusuf College after which he graduated in Engineering specializing in Civil engineering. Khan was raised in the Kamathipura neighbourhood of Mumbai after his family moved there from Kabul. He is an ethnic Pashtun of the Kakar tribe.

Khan had three brothers, Shams ur Rehman, Fazal Rehman and Habib ur Rehman. His father was Abdul Rahman Khan from Kandahar, Afghanistan while his mother was Iqbal Begum from Pishin, British India (now in Balochistan, Pakistan). Khan was born in Kabul, Afghanistan, on 22 October 1937.

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