What unix commands are guaranteed to exist for exec?

hi,
does anyone know if there is a list of commands that are common to all unix platforms, that you could call from a Runtime.exec?
I'm interested in 'hostname' and 'which' at the moment
thanks,
asjf

When you do exec(), no environment variables will be passed to the
commandline you are executing, so "/usr/bin/which" would not work,
since it uses PATH env variable. If you want, you can pass
the environment through one of the overloaded exec
calls.that was my understanding too, but doing
Runtime.exec("/usr/bin/which which")
returns
"/usr/bin/which"
or even doing just Runtime.exec("which which") gives the same result
maybe the JVM is being helpful somehow? (although I still don't understand where /usr/bin/env is getting its environment variables from?)
Most of the common unix utilities are in /usr/binthanks! theres quite a lot of them..

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What unix commands are guaranteed to exist for exec?

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