Github user BigOneLiu commented on the issue:
https://github.com/apache/flink/pull/5609
@zentol thx for comment.
I checked my system SUSE 11 SP4(which is a wildly used version),sed version
is 4.1.5,and it do not support '-E'. I don't konw how many linux version use
sed 4.1.5.
According to the source code,'-E' is exactly the same as '-r' and '-E' is
Undocumented.
So maybe '-r' is more compatible.
If don't need to be changed,at least note in the doc that "log may not work
well in SUSE 11".---
