diff --git a/.gitignore b/.gitignore
index 45a6c40..c743c07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 *~
 rjv
+linux-amd*
+linux-arm*
diff --git a/manage.sh b/manage.sh
new file mode 100755
index 0000000..9448b5f
--- /dev/null
+++ b/manage.sh
@@ -0,0 +1,89 @@
+#!/bin/bash
+set -e
+
+cmd="$1"
+app="rjv"
+
+if test ! "$cmd"; then
+    echo "command required."
+    echo
+    echo "available commands:"
+    # alphabetical order
+    echo "  build               build project"
+    echo "  build.all           build project, ignore cache"
+    echo "  build.release       build project for distribution"
+    echo "  clean               deletes all generated files"
+    exit 1
+fi
+
+shift
+rest=$*
+
+if test "$cmd" = "build"; then
+    ./manage.sh clean
+    # CGO_ENABLED=0 skips CGO and linking against glibc to build static binaries.
+    # -v 'verbose'
+    CGO_ENABLED=0 go build \
+        -v
+    echo "wrote $app"
+    exit 0
+
+elif test "$cmd" = "build.all"; then
+    # CGO_ENABLED=0 skips CGO and linking against glibc to build static binaries.
+    # -a 'build all'
+    # -v 'verbose'
+    ./manage.sh clean
+    CGO_ENABLED=0 go build \
+        -a \
+        -v
+    exit 0
+
+elif test "$cmd" = "build.release"; then
+    # GOOS is 'Go OS' and is being explicit in which OS to build for.
+    # CGO_ENABLED=0 skips CGO and linking against glibc to build static binaries.
+    # ld -s is 'disable symbol table'
+    # ld -w is 'disable DWARF generation'
+    # -trimpath removes leading paths to source files
+    # -v 'verbose'
+    # -o 'output'
+    set -u
+    version="$1" # 1.0.0
+    GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build \
+        -ldflags "-s -w -X main.APP_VERSION=$version" \
+        -trimpath \
+        -v \
+        -o linux-amd64
+    upx linux-amd64
+    sha256sum linux-amd64 > linux-amd64.sha256
+
+    GOOS=linux GOARCH=arm64 CGO_ENABLED=0 go build \
+        -ldflags "-s -w -X main.APP_VERSION=$version" \
+        -trimpath \
+        -v \
+        -o linux-arm64
+    upx linux-arm64
+    sha256sum linux-arm64 > linux-arm64.sha256
+    echo ---
+    go version
+    echo ---
+    upx --version
+    echo ---
+    du -sh linux-a*
+    echo ---
+    echo "done"
+    exit 0
+
+elif test "$cmd" = "clean"; then
+    # -f 'force' don't fail if file doesn't exist.
+    # -v 'verbose' print the name of the file that was deleted.
+    tbd=(
+        "main" "$app" # generated by 'build'
+        "linux-amd64" "linux-amd64.sha256 linux-arm64" "linux-arm64.sha256" # generated by 'release'
+    )
+    rm -fv ${tbd[@]}
+    exit 0
+
+fi
+
+echo "unknown command: $cmd"
+exit 1