/usr/share/antlr4/grun is in antlr4 4.5.3-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
CLASSPATH=.:/usr/share/java/antlr4.jar:/usr/share/java/antlr4-runtime.jar
exec java -cp $CLASSPATH org.antlr.v4.gui.TestRig "$@"
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