Update README.md

facetint · Apr 3, 2024 · ca4b7a7 · ca4b7a7
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@@ -311,6 +311,11 @@ echo $0
 ```
 Should print the first argument of your program. (eg: ./minishell)
 
+```bash
+env | grep SHLVL
+```
+This variable should be increased by 1 at init. If the inherited value is bigger than 999 bash sets it to 1 with a warning.
+
 ### Extreme
 You don't have to implement these features.
 ```bash