1 files changed, 3 insertions, 2 deletions
diff --git a/kerl b/kerl
index a005976..540f4f5 100755
--- a/kerl
+++ b/kerl
@@ -1114,8 +1114,9 @@ ACTIVATE_CSH
     fi
 
     PID=$$
-    PARENT_PID=$(ps -p $PID -o ppid | grep -E "[0-9]+" -o)
-    PARENT_CMD=$(ps -p "$PARENT_PID" -o ucomm | tail -n 1)
+    PARENT_PID=$(ps -p $PID -o ppid=) || exit 1
+    # shellcheck disable=SC2086
+    PARENT_CMD=$(ps -p $PARENT_PID -o ucomm | tail -n 1)
     case "$PARENT_CMD" in
         fish)
             SHELL_SUFFIX=".fish"