scala - What is the first semicolon in `addCommandAlias` method used for in SBT? -

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for example, have write alias this:

addcommandalias("make-idea", ";updateclassifiers; updatesbtclassifiers; gen-idea sbt-classifiers")

instead of 

addcommandalias("make-idea", "updateclassifiers; updatesbtclassifiers; gen-idea sbt-classifiers")

if skip first semicolon, sbt complain.. have ideas first ; in second argument of addcommandalias do?

this sbt's syntax specify multiple commands. normal sbt cli behavior , not specific addcommandalias.

the same happens in sbt shell:

sbt> updateclassifiers; updatesbtclassifiers; gen-idea sbt-classifiers [error] expected id character // etc.  sbt> ; updateclassifiers; updatesbtclassifiers; gen-idea sbt-classifiers // expected

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