You want to get bash for your Unix system, or you want to make sure you have the latest version.
If it’s not already installed or in your operating system’s program repository, check Chet Ramey’s bash page for binary downloads, or build it from source (see Appendix E).
According to Chet Ramey’s bash page (http://tiswww.tis.case.edu/~chet/bash/bashtop. html):
Solaris 2.x, Solaris 7, and Solaris 8 users can get a precompiled version of bash-3.0from the Sunfreeware site.
Sun ships bash-2.03 with Solaris 8 distributions, ships bash- 2.05 as a supported part of Solaris 9, and ships bash-3.0 as a supported part of Solaris 10 (directly on the Solaris 10 CD).
AIX users can get precompiled versions of older releases of bash for various versions of AIX from Groupe Bull, and sources and binaries of current releases for various AIX releases from UCLA.
IBM makes bash-3.0 available for AIX 5L as part of the AIX toolbox for [GNU/]Linux applications. They use RPM format; you can get RPM for AIX from there, too.
SGI users can get an installable version of bash-2.05b from the SGI Freeware page. HP-UX users can get bash-3.0 binaries and source code from the Software Porting and Archive Center for HP-UX.
Tru64 Unix users can get sources and binaries for bash-2.05b from the HP/Compaq Tru64 Unix Open Source Software Collection.