我一直在关注本指南，了解如何区分 Microsoft Word 文档，但我遇到了这个错误：
Usage: /usr/bin/docx2txt.pl [infile.docx|-|-h] [outfile.txt|-]
/usr/bin/docx2txt.pl < infile.docx
/usr/bin/docx2txt.pl < infile.docx > outfile.txt
In second usage, output is dumped on STDOUT.
Use '-h' as the first argument to get this usage information.
Use '-' as the infile name to read the docx file from STDIN.
Use '-' as the outfile name to dump the text on STDOUT.
Output is saved in infile.txt if second argument is omitted.
Note: infile.docx can also be a directory name …