High Quality Content by WIKIPEDIA articles! Debian Almquist shell (dash) is a Unix shell, much smaller than bash but still aiming at POSIX-compliancy. It requires less disk space but is also less feature-rich. Some missing features, such as the $LINENO variable , are required by POSIX. Dash is a direct descendant of the NetBSD version of the Almquist Shell (ash). It was ported to Linux by Herbert Xu in early 1997. It was renamed to dash in 2002. Dash, like ash, executes shell scripts faster than bash and depends on fewer libraries.

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