zkServer.sh uses sh's builtin echo on BSD, behaves incorrectly.

                 Key: ZOOKEEPER-722
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-722
             Project: Zookeeper
          Issue Type: Bug
          Components: scripts
         Environment: Mac OS X
            Reporter: Ivan Kelly
            Priority: Minor

zkServer.sh output the PID of the zookeeper process with:
echo -n $! > "$ZOOPIDFILE"

This uses -n which sh's builtin echo does not support. From echo's manpage.
     Some shells may provide a builtin echo command which is similar or 
identical to this utility.  Most notably, the builtin echo in sh(1) does not 
     the -n option.  Consult the builtin(1) manual page.

This means that echo -n PID > ZOOPIDFILE will mean the contents of ZOOPIDFILE 
will be "-n PID". This stops zkServer.sh stop from working correctly.

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