Red Hat Linux 7.1 Linux Shells

What do the following shells do?
/bin/sh
/bin/csh
/bin/false
/bin/bash
/bin/sync
/bin/shutdown
/bin/halt
/dev/null
/bin/true
/bin/bash2
/bin/ash
/bin/bsh
/bin/tcsh

Thank u so much for ur answers to me.