bash: zkServer.sh: command not found的问题

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在linux上安装zookeeper 时，启动 经常爆出一个问题
bash: zkServer.sh: command not found
怎么解决呢？
./zkServer.sh start

root@hadoop001 bin]# ll
total 36
-rwxr-xr-x 1 bmonitor bmonitor  232 Feb  6  2016 README.txt
-rwxr-xr-x 1 bmonitor bmonitor 1937 Feb  6  2016 zkCleanup.sh
-rwxr-xr-x 1 bmonitor bmonitor 1056 Feb  6  2016 zkCli.cmd
-rwxr-xr-x 1 bmonitor bmonitor 1534 Feb  6  2016 zkCli.sh
-rwxr-xr-x 1 bmonitor bmonitor 1628 Feb  6  2016 zkEnv.cmd
-rwxr-xr-x 1 bmonitor bmonitor 2696 Feb  6  2016 zkEnv.sh
-rwxr-xr-x 1 bmonitor bmonitor 1089 Feb  6  2016 zkServer.cmd
-rwxr-xr-x 1 bmonitor bmonitor 6773 Feb  6  2016 zkServer.sh
[root@hadoop001 bin]# zkServer.sh start
bash: zkServer.sh: command not found
[root@hadoop001 bin]# zkServer.sh
bash: zkServer.sh: command not found
[root@hadoop001 bin]# zkServer.sh start
bash: zkServer.sh: command not found
[root@hadoop001 bin]# ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /home/yfmcp/zookeeper/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED