bash#proftpd bash:proftpd:command not found 为什么？

Question

opensolaris 200805 安装proftpd-1.3.2

bash#cd /usr/proftpd-1.3.2

bash#./configure -prefix=/opt/proftpd

bash#make

bash#make install

bash#cd /opt/proftpd/sbin

bash#ls

ftpshut    in.proftpd    proftpd

bash#proftpd

bash:proftpd:command not found

为什么？？？？？？？？？？

Answer 1

. 不在PATH环境变量中
执行./proftpd