diff --git a/lang/c/build.sh b/lang/c/build.sh
index ff0c16f..6753e77 100755
--- a/lang/c/build.sh
+++ b/lang/c/build.sh
@@ -42,57 +42,62 @@
   rm -f examples/quickstop.db
 }
 
-case "$1" in
+for target in "$@"
+do
 
-  interop-data-generate)
-    prepare_build
-    make -C $build_dir
-    $build_dir/tests/generate_interop_data "../../share/test/schemas/interop.avsc"  "../../build/interop/data"
-    ;;
+  case "$target" in
 
-  interop-data-test)
-    prepare_build
-    make -C $build_dir
-    $build_dir/tests/test_interop_data "../../build/interop/data"
-    ;;
+    interop-data-generate)
+      prepare_build
+      make -C $build_dir
+      $build_dir/tests/generate_interop_data "../../share/test/schemas/interop.avsc"  "../../build/interop/data"
+      ;;
 
-  lint)
-    echo 'This is a stub where someone can provide linting.'
-    ;;
+    interop-data-test)
+      prepare_build
+      make -C $build_dir
+      $build_dir/tests/test_interop_data "../../build/interop/data"
+      ;;
 
-  test)
-    prepare_build
-    make -C $build_dir
-    make -C $build_dir test
-    ;;
+    lint)
+      echo 'This is a stub where someone can provide linting.'
+      ;;
 
-  dist)
-    prepare_build
-    cp ../../share/VERSION.txt $root_dir
-    make -C $build_dir docs
-    # This is a hack to force the built documentation to be included
-    # in the source package.
-    cp $build_dir/docs/*.html $root_dir/docs
-    make -C $build_dir package_source
-    rm $root_dir/docs/*.html
-    if [ ! -d $dist_dir ]; then
-      mkdir -p $dist_dir
-    fi
-    if [ ! -d $doc_dir ]; then
-      mkdir -p $doc_dir
-    fi
-    mv $build_dir/$tarball $dist_dir
-    cp $build_dir/docs/*.html $doc_dir
-    clean
-    ;;
+    test)
+      prepare_build
+      make -C $build_dir
+      make -C $build_dir test
+      ;;
 
-  clean)
-    clean
-    ;;
+    dist)
+      prepare_build
+      cp ../../share/VERSION.txt $root_dir
+      make -C $build_dir docs
+      # This is a hack to force the built documentation to be included
+      # in the source package.
+      cp $build_dir/docs/*.html $root_dir/docs
+      make -C $build_dir package_source
+      rm $root_dir/docs/*.html
+      if [ ! -d $dist_dir ]; then
+        mkdir -p $dist_dir
+      fi
+      if [ ! -d $doc_dir ]; then
+        mkdir -p $doc_dir
+      fi
+      mv $build_dir/$tarball $dist_dir
+      cp $build_dir/docs/*.html $doc_dir
+      clean
+      ;;
 
-  *)
-    echo "Usage: $0 {interop-data-generate|interop-data-test|lint|test|dist|clean}"
-    exit 1
-esac
+    clean)
+      clean
+      ;;
+
+    *)
+      echo "Usage: $0 {interop-data-generate|interop-data-test|lint|test|dist|clean}"
+      exit 1
+  esac
+
+done
 
 exit 0
diff --git a/lang/csharp/build.sh b/lang/csharp/build.sh
index afa4859..37063be 100755
--- a/lang/csharp/build.sh
+++ b/lang/csharp/build.sh
@@ -23,64 +23,70 @@
 ROOT=../..
 VERSION=`cat $ROOT/share/VERSION.txt`
 
-case "$1" in
+for target in "$@"
+do
 
-  lint)
-    echo 'This is a stub where someone can provide linting.'
-    ;;
+  case "$target" in
 
-  test)
-    dotnet build --configuration Release Avro.sln
+    lint)
+      echo 'This is a stub where someone can provide linting.'
+      ;;
 
-    # AVRO-2442: Explictly set LANG to work around ICU bug in `dotnet test`
-    LANG=en_US.UTF-8 dotnet test  --configuration Release --no-build \
-        --filter "TestCategory!=Interop" Avro.sln
-    ;;
+    test)
+      dotnet build --configuration Release Avro.sln
 
-  perf)
-    pushd ./src/apache/perf/
-    dotnet run --configuration Release --framework netcoreapp2.2
-    ;;
+      # AVRO-2442: Explictly set LANG to work around ICU bug in `dotnet test`
+      LANG=en_US.UTF-8 dotnet test  --configuration Release --no-build \
+          --filter "TestCategory!=Interop" Avro.sln
+      ;;
 
-  dist)
-    # pack NuGet packages
-    dotnet pack --configuration Release Avro.sln
+    perf)
+      pushd ./src/apache/perf/
+      dotnet run --configuration Release --framework netcoreapp2.2
+      ;;
 
-    # add the binary LICENSE and NOTICE to the tarball
-    mkdir build/
-    cp LICENSE NOTICE build/
+    dist)
+      # pack NuGet packages
+      dotnet pack --configuration Release Avro.sln
 
-    # add binaries to the tarball
-    mkdir build/main/
-    cp -R src/apache/main/bin/Release/* build/main/
-    mkdir build/codegen/
-    cp -R src/apache/codegen/bin/Release/* build/codegen/
+      # add the binary LICENSE and NOTICE to the tarball
+      mkdir build/
+      cp LICENSE NOTICE build/
 
-    # build the tarball
-    mkdir -p ${ROOT}/dist/csharp
-    (cd build; tar czf ${ROOT}/../dist/csharp/avro-csharp-${VERSION}.tar.gz main codegen LICENSE NOTICE)
+      # add binaries to the tarball
+      mkdir build/main/
+      cp -R src/apache/main/bin/Release/* build/main/
+      mkdir build/codegen/
+      cp -R src/apache/codegen/bin/Release/* build/codegen/
 
-    # build documentation
-    doxygen Avro.dox
-    mkdir -p ${ROOT}/build/avro-doc-${VERSION}/api/csharp
-    cp -pr build/doc/* ${ROOT}/build/avro-doc-${VERSION}/api/csharp
-    ;;
+      # build the tarball
+      mkdir -p ${ROOT}/dist/csharp
+      (cd build; tar czf ${ROOT}/../dist/csharp/avro-csharp-${VERSION}.tar.gz main codegen LICENSE NOTICE)
 
-  interop-data-generate)
-    dotnet run --project src/apache/test/Avro.test.csproj --framework netcoreapp2.2 ../../share/test/schemas/interop.avsc ../../build/interop/data
-    ;;
+      # build documentation
+      doxygen Avro.dox
+      mkdir -p ${ROOT}/build/avro-doc-${VERSION}/api/csharp
+      cp -pr build/doc/* ${ROOT}/build/avro-doc-${VERSION}/api/csharp
+      ;;
 
-  interop-data-test)
-    LANG=en_US.UTF-8 dotnet test --filter "TestCategory=Interop"
-    ;;
+    interop-data-generate)
+      dotnet run --project src/apache/test/Avro.test.csproj --framework netcoreapp2.2 ../../share/test/schemas/interop.avsc ../../build/interop/data
+      ;;
 
-  clean)
-    rm -rf src/apache/{main,test,codegen,ipc,msbuild,perf}/{obj,bin}
-    rm -rf build
-    rm -f  TestResult.xml
-    ;;
+    interop-data-test)
+      LANG=en_US.UTF-8 dotnet test --filter "TestCategory=Interop"
+      ;;
 
-  *)
-    echo "Usage: $0 {lint|test|clean|dist|perf|interop-data-generate|interop-data-test}"
-    exit 1
-esac
+    clean)
+      rm -rf src/apache/{main,test,codegen,ipc,msbuild,perf}/{obj,bin}
+      rm -rf build
+      rm -f  TestResult.xml
+      ;;
+
+    *)
+      echo "Usage: $0 {lint|test|clean|dist|perf|interop-data-generate|interop-data-test}"
+      exit 1
+
+  esac
+
+done
diff --git a/lang/js/build.sh b/lang/js/build.sh
index a936a04..4d64146 100755
--- a/lang/js/build.sh
+++ b/lang/js/build.sh
@@ -19,23 +19,26 @@
 
 cd `dirname "$0"`
 
-case "$1" in
-  lint)
-    npm run lint
-    ;;
-  test)
-    npm install
-    npm run cover
-    ;;
-  dist)
-    npm pack
-    mkdir -p ../../dist/js
-    mv avro-js-*.tgz ../../dist/js
-    ;;
-  clean)
-    rm -rf coverage
-    ;;
-  *)
-    echo "Usage: $0 {lint|test|dist|clean}" >&2
-    exit 1
-esac
+for target in "$@"
+do
+  case "$target" in
+    lint)
+      npm run lint
+      ;;
+    test)
+      npm install
+      npm run cover
+      ;;
+    dist)
+      npm pack
+      mkdir -p ../../dist/js
+      mv avro-js-*.tgz ../../dist/js
+      ;;
+    clean)
+      rm -rf coverage
+      ;;
+    *)
+      echo "Usage: $0 {lint|test|dist|clean}" >&2
+      exit 1
+  esac
+done
diff --git a/lang/php/build.sh b/lang/php/build.sh
index 96e011f..fa38cb8 100755
--- a/lang/php/build.sh
+++ b/lang/php/build.sh
@@ -44,41 +44,43 @@
     cp "$tarball" "../$dist_dir"
 }
 
-case "$1" in
-     interop-data-generate)
-       php test/generate_interop_data.php
-       ;;
+for target in "$@"
+do
+  case "$target" in
+    interop-data-generate)
+      php test/generate_interop_data.php
+      ;;
 
-     test-interop)
-       phpunit test/InterOpTest.php
-       ;;
+    test-interop)
+      phpunit test/InterOpTest.php
+      ;;
 
-     lint)
-       echo 'This is a stub where someone can provide linting.'
-       ;;
+    lint)
+      echo 'This is a stub where someone can provide linting.'
+      ;;
 
-     test)
-       phpunit -v test/AllTests.php
+    test)
+      phpunit -v test/AllTests.php
 
-       # Check backward compatibility with PHP 5.x if both PHP 5.6 and PHPUnit 5.7 are installed.
-       # TODO: remove this check when we drop PHP 5.x support in the future
-       if command -v php5.6 > /dev/null && phpunit --version | grep -q 'PHPUnit 5.7'; then
-         echo 'Checking backward compatibility with PHP 5.x'
-         php5.6 $(which phpunit) -v test/AllTests.php
-       fi
-       ;;
+      # Check backward compatibility with PHP 5.x if both PHP 5.6 and PHPUnit 5.7 are installed.
+      # TODO: remove this check when we drop PHP 5.x support in the future
+      if command -v php5.6 > /dev/null && phpunit --version | grep -q 'PHPUnit 5.7'; then
+        echo 'Checking backward compatibility with PHP 5.x'
+        php5.6 $(which phpunit) -v test/AllTests.php
+      fi
+      ;;
 
-     dist)
-       dist
-       ;;
+    dist)
+      dist
+      ;;
 
-     clean)
-       clean
-       ;;
+    clean)
+      clean
+      ;;
 
-     *)
-       echo "Usage: $0 {interop-data-generate|test-interop|lint|test|dist|clean}"
-esac
-
+    *)
+      echo "Usage: $0 {interop-data-generate|test-interop|lint|test|dist|clean}"
+  esac
+done
 
 exit 0
diff --git a/lang/ruby/build.sh b/lang/ruby/build.sh
index 3cb81c2..701d4ed 100755
--- a/lang/ruby/build.sh
+++ b/lang/ruby/build.sh
@@ -28,7 +28,9 @@
 gem install --no-document -v 1.17.3 bundler
 bundle install
 
-case "$1" in
+for target in "$@"
+do
+  case "$target" in
     lint)
       rubocop --lint
       ;;
@@ -49,4 +51,5 @@
     *)
       echo "Usage: $0 {lint|test|dist|clean}"
       exit 1
-esac
+  esac
+done