Shell Redirection Order

A Brief Intro When i take a look at bash’s documentation about shell redirection , i found out that this two examples are different. This one: ls > dirlist 2>&1 and this one: ls 2>&1 > dirlist So let’s try understanding why it is different. What 2>&1 means? From this hacker news comment , it looks like the expression 2>&1 is like calling system call dup2(2, 1). If we take a look at the man page (man dup2), here is one of the description:

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