diff --git a/jdftxcov.xml b/jdftxcov.xml
deleted file mode 100644
index b9493f99..00000000
--- a/jdftxcov.xml
+++ /dev/null
@@ -1,64 +0,0 @@
-<?xml version="1.0" ?>
-<coverage version="7.6.1" timestamp="1728692014899" lines-valid="45" lines-covered="45" line-rate="1" branches-covered="0" branches-valid="0" branch-rate="0" complexity="0">
-	<!-- Generated by coverage.py: https://coverage.readthedocs.io/en/7.6.1 -->
-	<!-- Based on https://raw.githubusercontent.com/cobertura/web/master/htdocs/xml/coverage-04.dtd -->
-	<sources>
-		<source>src/custodian/jdftx</source>
-	</sources>
-	<packages>
-		<package name="." line-rate="1" branch-rate="0" complexity="0">
-			<classes>
-				<class name="jobs.py" filename="jobs.py" complexity="0" line-rate="1" branch-rate="0">
-					<methods/>
-					<lines>
-						<line number="3" hits="1"/>
-						<line number="4" hits="1"/>
-						<line number="5" hits="1"/>
-						<line number="7" hits="1"/>
-						<line number="9" hits="1"/>
-						<line number="11" hits="1"/>
-						<line number="14" hits="1"/>
-						<line number="41" hits="1"/>
-						<line number="44" hits="1"/>
-						<line number="53" hits="1"/>
-						<line number="54" hits="1"/>
-						<line number="59" hits="1"/>
-						<line number="68" hits="1"/>
-						<line number="71" hits="1"/>
-						<line number="74" hits="1"/>
-						<line number="75" hits="1"/>
-						<line number="76" hits="1"/>
-						<line number="77" hits="1"/>
-						<line number="78" hits="1"/>
-						<line number="79" hits="1"/>
-						<line number="80" hits="1"/>
-						<line number="81" hits="1"/>
-						<line number="82" hits="1"/>
-						<line number="83" hits="1"/>
-						<line number="84" hits="1"/>
-						<line number="85" hits="1"/>
-						<line number="86" hits="1"/>
-						<line number="87" hits="1"/>
-						<line number="89" hits="1"/>
-						<line number="92" hits="1"/>
-						<line number="93" hits="1"/>
-						<line number="94" hits="1"/>
-						<line number="95" hits="1"/>
-						<line number="98" hits="1"/>
-						<line number="99" hits="1"/>
-						<line number="100" hits="1"/>
-						<line number="101" hits="1"/>
-						<line number="102" hits="1"/>
-						<line number="103" hits="1"/>
-						<line number="104" hits="1"/>
-						<line number="106" hits="1"/>
-						<line number="107" hits="1"/>
-						<line number="110" hits="1"/>
-						<line number="111" hits="1"/>
-						<line number="112" hits="1"/>
-					</lines>
-				</class>
-			</classes>
-		</package>
-	</packages>
-</coverage>
diff --git a/src/custodian/jdftx/jobs.py b/src/custodian/jdftx/jobs.py
index fe9e19bf..81e21faa 100644
--- a/src/custodian/jdftx/jobs.py
+++ b/src/custodian/jdftx/jobs.py
@@ -56,7 +56,7 @@ def run(self, directory="./"):
         ):
             # use line buffering for stderr
             return subprocess.run(
-                shlex.split(),
+                shlex.split(cmd),
                 cwd=directory,
                 stdout=f_std,
                 stderr=f_err,
diff --git a/src/custodian/vasp/jobs.py b/src/custodian/vasp/jobs.py
index 85ca6426..a94957c2 100644
--- a/src/custodian/vasp/jobs.py
+++ b/src/custodian/vasp/jobs.py
@@ -268,11 +268,12 @@ def run(self, directory="./"):
                     cmd[-1] += ".gamma"
         logger.info(f"Running {' '.join(cmd)}")
         with (
-            open(os.path.join(directory, self.output_file), "w"),
-            open(os.path.join(directory, self.stderr_file), "w", buffering=1),
+            open(os.path.join(directory, self.output_file), "w") as f_std,
+            open(os.path.join(directory, self.stderr_file), "w", buffering=1) as f_err,
         ):
-            # use line buffering for stderrsubprocess.Popen(cmd, cwd=directory, stdout=f_std, stderr=f_err, start_new_session=True)
-            return  # pylint: disable=R1732
+            # use line buffering for stderr
+            return subprocess.Popen(cmd, cwd=directory, stdout=f_std, stderr=f_err, start_new_session=True)
+            # pylint: disable=R1732
 
     def postprocess(self, directory="./") -> None:
         """