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I’ve often came accross the following error message when executing a batch file :

bash: cannot redirect standard input from /dev/null: Permission denied
bash: /dev/null: Permission denied

Luckily I’ve found an easily solution to get rid of this annoying error message. You simply need to chmod /dev/null like that :

chmod ugo+rw /dev/null

That’s it, the error message shouldn’t occur anymore 🙂