如何使用 bash 工具搜索非 ASCII 字符？
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How to search for non-ASCII characters with bash tools?
提问by Jonas Stein
I have a large text file that contains a few unicode characters that make LaTeX crash. How can I find non-ASCII characters in a file with sed, and the like in a Linux bash?
我有一个大文本文件，其中包含一些使 LaTeX 崩溃的 unicode 字符。如何在 Linux bash 中使用 sed 等查找文件中的非 ASCII 字符？
回答by pixelbeat
Try:
尝试：
nonascii() { LANG=C grep --color=always '[^ -~]\+'; }
Which can be used like:
可以像这样使用：
printf '?TF8\n' | nonascii
Within []^means "not". So [^ -~]means characters not between space and ~. So excluding control chars, this matches non ASCII characters, and is a more portable though slightly less accurate version of [^\x00-\x7f]below. The \+means 1 or moreand will get multibye characters to have a color shown around the complete character(s), rather than interspersed in each byte, thus corrupting the multibyte sequence
内的[]^意思是“不是”。所以[^ -~]意味着字符不在空格和 ~ 之间。所以不包括控制字符，这匹配非 ASCII 字符，并且是一个更便携但稍微不太准确的[^\x00-\x7f]下面的版本。的\+手段1 or more和将得到multibye字符具有围绕完整的字符（一个或多个）中所示的颜色，而不是散布在每个字节，从而破坏多字节序列
回答by kev
Try this command:
试试这个命令：
grep -P '[^\x00-\x7f]' file
