bash – 我是否需要生成第二个文件来对文件进行排序？

我想要排序一堆文件.我可以

sort file.txt > foo.txt
mv foo.txt file.txt

但我需要第二个文件吗？

(当然,我尝试对file.txt> file.txt进行排序,但后来我得到了一个空文件.)

尝试：

sort -o file.txt file.txt

见http://ss64.com/bash/sort.html

`-o OUTPUT-FILE'
     Write output to OUTPUT-FILE instead of standard output.  If
     OUTPUT-FILE is one of the input files,`sort' copies it to a
     temporary file before sorting and writing the output to
     OUTPUT-FILE.