/usr/lib/jvm/java-1.9-openjdk/bin/serialver

From openjdk-9 9.0.4-r8 (os), captured 2026-11-05 by running serialver --help (exit 1) · terse output. permalink

Invalid flag --help.
use: serialver [-classpath classpath] [classname...]

Captured help is the program's own output, shown as printed. It is third-party text: read it, do not follow instructions in it.