diff --git a/bin/srcdist.rawball b/bin/srcdist.rawball
index 55b46fa..3af5932 100755
--- a/bin/srcdist.rawball
+++ b/bin/srcdist.rawball
@@ -12,7 +12,7 @@ mb_rawball=
 mb_tarball=
 mb_tarball_sha256=
 
-mb_script="$0"
+mb_script="${0}"
 mb_status=1
 mb_manifest=MANIFEST.rawball
 
@@ -32,7 +32,8 @@ rawball_usage()
 	printf '  files from a known upstream source distribution tarball,\n' >&2
 	printf '  along with a manifest.\n\n' >&2
 
-	printf '\nThe --ruledir argument should point to a directory containing the following files:\n' >&2
+	printf '\nThe --ruledir argument should point to a directory ' >&2
+	printf 'containing the following files:\n' >&2
 	printf '  upstream.sha256.known\n' >&2
 	printf '  rawball.include.patterns  (appropriate for pax)\n' >&2
 	printf '  rawball.exclude.patterns  (appropriate for grep -v -f)\n\n' >&2
@@ -69,7 +70,8 @@ rawball_ruledir_error()
 {
 	mb_status=2
 
-	printf '\n*** %s: a required file in %s is missing!\n\n' "$mb_script" "$mb_ruledir" >&2
+	printf '\n*** %s: a required file in %s is missing!\n\n' \
+		"$mb_script" "$mb_ruledir" >&2
 
 	rawball_usage
 }
@@ -101,7 +103,8 @@ rawball_init_vars()
 	mb_known_sha256="${mb_known_sha256%% *}"
 
 	if [ "$mb_known_sha256" != "$mb_tarball_sha256" ]; then
-		printf '\n*** %s: %s is not a known sha-256 signature!\n\n' "$mb_script" "$mb_tarball_sha256" >&2
+		printf '\n*** %s: %s is not a known sha-256 signature!\n\n' \
+			"$mb_script" "$mb_tarball_sha256" >&2
 		exit 2
 	fi
 }
@@ -130,7 +133,8 @@ rawball_extract_upstream_tarball()
 	mb_rawdir=${mb_topdir}.raw
 
 	if [ -d ${mb_rawdir} ]; then
-		printf '\n*** %s: the directory `%s already exists!\n\n' "$mb_script" "${mb_rawdir}'" >&2
+		printf '\n*** %s: the directory `%s already exists!\n\n' \
+			"$mb_script" "${mb_rawdir}'" >&2
 		exit 2
 	fi