Question

Could somebody explain what this bit of code means please ?

I believe the second line is “if the exit status is zero”, then echo “valid command” but I dont understand the first line

$@ &>/dev/null
if [[ $? = 0 ]]
then
   echo "Valid command"
fi

Answer 1

I’d like to add that this is unnecessarily verbose and could be shortened to

if "$@" &>/dev/null
then
    echo "Valid command"
fi

or even shorter

"$@" &>/dev/null && echo "Valid command"