According to Chet Ramey’s bash page (http://tiswww.tis.case.edu/~chet/bash/bashtop.html), Mac OS 10.2 (Jaguar) and newer ship with bash as /bin/sh. 10.4 (Tiger) has version 2.05b.0(1)-release (powerpc-apple-darwin8.0). There are also precompiled OS X packages of bash-2.05 available from many web sites. One such package is at HMUG. Bash for Darwin (the base for Mac OS X) is available from Fink or DarwinPorts.
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