Answer by cjm for What shells were used on early unix systems?
The original Unix shell was the Thompson shell. There was also a derivative of it called the PWB shell. (Source: Historic Unix shells at Wikipedia)
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According to wikipedia, the Bourne shell was introduced in 1977 and C shell in 1978, but unix itself dates back to 1969. If you were using a unix system before 1977, what shell would you have been...
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