Debian Almquist Shell
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Debian Almquist Shell is an implementation of UNIX Shell. Other implementations of UNIX Shell.
This is a variant of Almquist Shell, which ships as /bin/sh on Debian Linux systems. It has a few non-POSIX convenience features added to the original ash, including echo -n (echo without newline; the POSIX equivalent is printf) and the ability to combine test expressions with the Boolean operators -a (AND) and -o (OR).
Debian Almquist shell at Wikipedia