我正在尝试对多列进行排序。结果并不如预期。
这是我的数据（people.txt）：
Simon Strange 62
Pete Brown 37
Mark Brown 46
Stefan Heinz 52
Tony Bedford 50
John Strange 51
Fred Bloggs 22
James Bedford 21
Emily Bedford 18
Ana Villamor 44
Alice Villamor 50
Francis Chepstow 56
以下工作正常：
bash-3.2$ sort -k2 -k3 <people.txt
Emily Bedford 18
James Bedford 21
Tony Bedford 50
Fred Bloggs 22
Pete Brown 37
Mark Brown 46
Francis Chepstow 56
Stefan Heinz 52
John Strange 51
Simon Strange 62
Ana Villamor 44
Alice Villamor 50 …sort ×1