BASH Shell is the default shell in Linux. It can be supplemented by tab, and historical commands such as up/down key switching are easier to use than the default KSh shell in Aix (most Unix systems.
All Linux software that can be installed under AIX provided by IBM, including bash shell:
Http://www-03.ibm.com/systems/power/software/aix/linux/toolbox/alpha.html
1. Download Bash software
Ftp://ftp.software.ibm.com/aix/freeSoftware/aixtoolbox/RPMS/ppc/bash/bash-3.2-1.aix5.2.ppc.rpm
2. Install Bash software
Rpm-IVH bash-3.2-1.aix5.2.ppc.rpm
3. Modify the user environment variable and add $ home/. Profile:
Export PS1 = "[\ U @ \ H \ W] #"
4. Modify/etc/security/login. cfg and add the bash command in the shells attribute:
Shells =/bin/bash,/bin/sh,/bin/bsh ......
5. Modify/etc/passwd and modify the user's default shell, for example:
Root :! : 0: 0: // bin/bash