当我即将完成此问题的撰写时，我运行parallel --version报告该版本，却发现:

As I was about to complete writing this question, I ran parallel --version to report the version, only to find:

警告:您正在使用--toolf.如果正在使用，请使用--gnu.

WARNING: YOU ARE USING --tollef. IF THINGS ARE ACTING WEIRD USE --gnu.

我不清楚为什么默认情况下会设置该标志.不用说，使用--gnu可行！

It is not clear to me why that flag is set by default. Needless to say, using --gnu worked!

我认为发布此邮件可以节省一些人的挫败感和困惑.

Thought I would post this to save someone hours of frustration and confusion.

要永久解决此问题(至少在Ubuntu中)，请删除/etc/parallel/config

To fix this permanently (in Ubuntu at least), delete the --tollef flag in /etc/parallel/config