I did check master build with fix applied, it seem to work as intended:
```
$ cd assemblies/apache-karaf/target/assembly/bin
$ ./start
$ ./client instance:list
client: JAVA_HOME not set; results may vary
Logging in as karaf
SSH Port │ SSH Host │ RMI Registry │ RMI Registry Host │ RMI Server │ RMI
Server Host │ State │ PID │ Name
─────────┼──────────┼──────────────┼───────────────────┼────────────┼─────────────────┼─────────┼───────┼─────
8101 │ 0.0.0.0 │ 1099 │ 127.0.0.1 │ 44444 │
127.0.0.1 │ Started │ 31653 │ root
$ echo $?
0
$ ./client non-existent-command
client: JAVA_HOME not set; results may vary
Logging in as karaf
Command not found: non-existent-command
$ echo $?
1
```
[ Full content available at: https://github.com/apache/karaf/pull/600 ]
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