(sh, Shellish). The original command-line interpreter shell and script language
for Unix written by S.R. Bourne of Bell Laboratories in 1978. sh has been
superseded for interactive use by the Berkeley C shell, csh but still widely
used for writing shell scripts.
There were even earlier shells, see glob. [Details?]
ash is a Bourne Shell clone.
["Unix Time-Sharing System: The Unix Shell", S.R. Bourne, Bell Sys Tech J
57(6):1971-1990 (Jul 1978)].
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