Run mplayer command in background replace &1 with 1

Question

The formal way to run mplayer in background.

mplayer some.mkv </dev/null >/dev/null 2>&1 &
[3]9536

[3]9536 means pid of the mplayer command is 9536.
If i replace &1 with 1 for the above command:

mplayer some.mkv </dev/null >/dev/null 2>1 &
[4] 9590
[3]   Done                    mplayer some.mkv < /dev/null > /dev/null 2> 1

Why got the extra output here?

[3]   Done                    mplayer some.mkv < /dev/null > /dev/null 2> 1

that other guy · Accepted Answer · 2018-09-22T04:20:40.707

It's not related to your change. This happened because your previous mplayer instance exited in the mean time. Here's another example:

$ sleep 1 &
[1] 18155                                   # Sleep #1 started in background
$ sleep 1 &
[2] 18163                                   # Sleep #2 started in background
[1]   Done                    sleep 1       # Sleep #1 finished because it's been a second

Replacing 2>&1 with 2>1 makes mplayer status and errors go to a file named 1 in the current directory. I don't know why you would do such a thing, but bash is happy to oblige.

Run mplayer command in background replace &1 with 1

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