No, >/dev/null2>&1 is. If try your example but with file instead null, stderr content not in file.
Because x>y not redirect x to y, but duplicate y and set x to y-duplicate. See bash manpage REDIRECTION (your example in that section for what not work).
As i understand, your example set 2 to what 1 is, then set 1 to null. Now 2 not null, but what 1 before.
Yes, but
2>&1 > /dev/nullis the real hero.No,
> /dev/null 2>&1is. If try your example but with file instead null, stderr content not in file.Because x>y not redirect x to y, but duplicate y and set x to y-duplicate. See bash manpage REDIRECTION (your example in that section for what not work).
As i understand, your example set 2 to what 1 is, then set 1 to null. Now 2 not null, but what 1 before.
So, the joke is that it should hide all output.