Bad interpreting of iotdb-env.sh causing somaxconn warning failed

See the code of iotdb-env.sh

https://github.com/apache/iotdb/blob/b76a799c4346ba16caf468e0c8f191949ff612b4/server/src/assembly/resources/conf/iotdb-env.sh#L39

https://github.com/apache/iotdb/blob/b76a799c4346ba16caf468e0c8f191949ff612b4/server/src/assembly/resources/conf/iotdb-env.sh#L49

I have tested in my MacBook and a Linux virtual machine, the command outputs are:

Linux

[root@a0933215a07b iotdb]# sysctl net.core.somaxconn
net.core.somaxconn = 128

MacOS

[myuser iotdb]# sysctl kern.ipc.somaxconn
kern.ipc.somaxconn: 128 

Here we can see using awk '{print $2}' will get '=' in Linux, casuing the condition check failed.

The best solution is using sysctl -n option directly:

Linux

[root@a0933215a07b iotdb]# sysctl -n net.core.somaxconn
128

MacOS

[myuser iotdb]# sysctl -n kern.ipc.somaxconn
128