Verbosity
Logging in Scala CLI can be controlled in a number of ways.
println("Hello")
Logs, warnings and errors will be printed by default.
scala-cli Hello.sc
Compiling project (Scala 3.2.2, JVM)
Compiled project (Scala 3.2.2, JVM)
Hello
Silencing logs with -q
All logs except for errors can be silenced by passing the -q
option.
scala-cli Hello.sc -q
Hello
Increasing verbosity with -v
You can increase verbosity by passing the -v
option, to print debugging logs or gain extra context.
scala-cli Hello.sc -v
Compiling project (Scala 3.2.2, JVM)
Compiled project (Scala 3.2.2, JVM)
Running ~/Library/Java/JavaVirtualMachines/corretto-17.0.5/Contents/Home/bin/java -cp ~/IdeaProjects/scala-cli-tests/hello1/.scala-build/project_853f6d1dbb-28a878fa14/classes/main:~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-library_3/3.2.2/scala3-library_3-3.2.2.jar:~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.10/scala-library-2.13.10.jar Hello_sc
Hello
You can increase verbosity even further by passing the -v
option multiple times.
scala-cli Hello.sc -v -v
Fetching List(Dependency(org.scala-lang:scala3-compiler_3, 3.2.2, Configuration(), Set(), Publication(, Type(), Extension(), Classifier()), false, true)), adding List(IvyRepository(Pattern(List(Const(file://~/Library/Caches/ScalaCli/local-repo/v0.2.0//), Var(organisation), Const(/), Var(module), Const(/), Opt(List(Const(scala_), Var(scalaVersion), Const(/))), Opt(List(Const(sbt_), Var(sbtVersion), Const(/))), Var(revision), Const(/), Var(type), Const(s/), Var(artifact), Opt(List(Const(-), Var(classifier))), Const(.), Var(ext))), None, None, true, true, true, false, None, true))
Found 13 artifacts:
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-compiler_3/3.2.2/scala3-compiler_3-3.2.2.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-interfaces/3.2.2/scala3-interfaces-3.2.2.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-library_3/3.2.2/scala3-library_3-3.2.2.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/tasty-core_3/3.2.2/tasty-core_3-3.2.2.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-asm/9.3.0-scala-1/scala-asm-9.3.0-scala-1.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/compiler-interface/1.3.5/compiler-interface-1.3.5.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/jline/jline-reader/3.19.0/jline-reader-3.19.0.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/jline/jline-terminal/3.19.0/jline-terminal-3.19.0.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/jline/jline-terminal-jna/3.19.0/jline-terminal-jna-3.19.0.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.10/scala-library-2.13.10.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/com/google/protobuf/protobuf-java/3.7.0/protobuf-java-3.7.0.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/util-interface/1.3.0/util-interface-1.3.0.jar
~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/net/java/dev/jna/jna/5.3.1/jna-5.3.1.jar
(...)
Hello
Warnings suppression
Some specific warning logs can be suppressed individually. That can be done by passing an appropriate option or by setting the appropriate global configuration key.