Hi,

busybox 1.31 introduced the bashism "wait -n". However, that command does not behave the way I expect it to.

Bash's "wait -n" will return when the *first* pid returns; this is not the case for the busybox ash.

In bash, the following script prints "5". In busybox ash, it prints "10".


```
#!/bin/sh

sleep 5 &
pid1=$!

sleep 10 &
pid2=$!

before=$(date +%s)
wait -n $pid1 $pid2
after=$(date +%s)

duration=$(( after - before ))
echo $duration
```