dynamic aliasing in bash

gistfile1.sh

        # here be dragons
        syscommon_eval_bin() {
                # figure out pwd
                # search params for lustre path
                chklfs() {
                        if [[ $PWD == *lustre* ]] || [[ "$*" == *lustre* ]]; then
                                return 0
                        else
                                return 1
                        fi
                }
                # check for executed binary
                case "$1" in
                        du|find)
                                local cmd
                                cmd=$1
                                shift
                                if chklfs $@; then
                                        rbh-${cmd} $*
                                else
                                        command ${cmd} $@
                                fi
                        ;;
                        *)
                                return 1
                        ;;
                esac
                
        }

# e.g.
alias du='syscommon_eval_bin du $@'
alias find='syscommon_eval_bin find $@'