diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9201430
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,6 @@
+SOURCES := $(shell cd ./src && find ./ -type f -and -not -name '*.vars')
+
+shellcheck:
+	cd ./src && shellcheck ${SOURCES}
+
+.PHONY: shellcheck
diff --git a/src/scripts/get_file_meta.sh b/src/scripts/get_file_meta.sh
index 4a0f99d..cd5cbc7 100644
--- a/src/scripts/get_file_meta.sh
+++ b/src/scripts/get_file_meta.sh
@@ -2,7 +2,9 @@
 
 set -e
 
+# shellcheck disable=SC2153
 directory="${DIRECTORY}"
+# shellcheck disable=SC2153
 files="${FILES}"
 
 if [ -z "$files" ]; then
@@ -14,7 +16,7 @@ fi
         echo "$directory/$file"
         if [ -e "$directory/$file" ]; then
             echo true
-            echo "$(stat --format=%Y "$directory/$file")"
+            stat --format=%Y "$directory/$file"
         else
             echo false
             echo "# --PLACEHOLDER--"
diff --git a/src/scripts/get_files.sh b/src/scripts/get_files.sh
index 7e2c997..34cadcb 100644
--- a/src/scripts/get_files.sh
+++ b/src/scripts/get_files.sh
@@ -2,9 +2,14 @@
 
 set -e
 
+# shellcheck disable=SC2153
 directory="${DIRECTORY}"
+# shellcheck disable=SC2153
 files="${FILES}"
+newline_str='
+'
 (
-    echo tar c $files >&2
-    IFS=$'\n' tar c $files
+    cd "$directory"
+    #shellcheck disable=SC2086
+    IFS="$newline_str" tar c $files
 )
diff --git a/src/scripts/put_files.sh b/src/scripts/put_files.sh
index 07f72bc..55587a2 100644
--- a/src/scripts/put_files.sh
+++ b/src/scripts/put_files.sh
@@ -2,8 +2,11 @@
 
 set -e
 
+# shellcheck disable=SC2153
 directory="${DIRECTORY}"
+# shellcheck disable=SC2153
 workdir="${WORKDIR}"
+# shellcheck disable=SC2153
 extract="${EXTRACT}"
 (
     if "$extract"; then