FULL PRODUCT VERSION :
java version "10" 2018-03-20
Java(TM) SE Runtime Environment 18.3 (build 10+46)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10+46, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Darwin M 17.5.0 Darwin Kernel Version 17.5.0: Mon Mar 5 22:24:32 PST 2018; root:xnu-4570.51.1~1/RELEASE_X86_64 x86_64

A DESCRIPTION OF THE PROBLEM :
Traditional commands, even deprecated ones like appletviewer are directly accessible from the command line. Reason for this is, that there are symlinks in /usr/bin which relay to the actual command

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
$ jlink
-bash: jlink: command not found


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
link should be directly executable like java is:

$ jlink
Error: --output must be specified
Usage: jlink <options> --module-path <modulepath> --add-modules <module>[,<module>...]
Use --help for a list of possible options

ACTUAL -
$ jlink
-bash: jlink: command not found


REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
It can be called in the actual location of the JVM

$ /Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Home/bin/jlink
Error: --output must be specified
Usage: jlink <options> --module-path <modulepath> --add-modules <module>[,<module>...]
Use --help for a list of possible options