unix commands installation

[kokoro]

Hi, i would like to know how to install more unix commands, like "su -".
Which package to install?

:)

Cause: errors in installing others packages like postgresql.

//opt/lib/ipkg/info/postgresql.postinst: 44: su: not found
Starting PostgreSQL: /opt/etc/init.d/S98postgresql: 66: cannot create /opt/var/pgsql/data/serverlog: Directory nonexistent
/opt/etc/init.d/S98postgresql: 66: su: not found

[CountZero]

try "sudo"

[kokoro]

More explanation:
I installed php-postgresql with these errors.
I can not change the installation package made by postgre team because of su not supported by our linux busybox. (su mandatory)

I guess someone already installed a package to have useful unix commands, no ?

[CountZero]

I have the su command, but not sure of the package.....

[CountZero]

the package to install is "coreutils"