(sh, Shellish). The original command-line interpretershell and script language for Unix written by S.R. Bourne of Bell Laboratories in 1978. sh has been superseded for interactive use by the BerkeleyC shell, csh but still widely used for writing shell scripts.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)].