猫yourfile.txt | TR -dc'[：alnum：] \\ n \\ r'| TR[：上：]''[：降低：]'
 

第一个 TR 删除特殊字符。 D 表示删除 C 表示补码（反转字符集）。因此， -dc 表示删除除指定的所有字符。在 \\ n 和 \\ r 被包括进来以preserve Linux或Windows风格的换行符，我假设你想

第二个转换大写字母为小写。

I am writing a bash script that I need to parse file names.

It will need to remove all special characters (including space): "!?.-_ and change all uppercase letters to lowercase. Something like this:

Some_randoM data1-A

More Data0

to:

somerandomdata1a

moredata0

I have seen lots of questions to do this in many different programming languages, but not in bash. Is there a good way to do this?

cat yourfile.txt | tr -dc '[:alnum:]\n\r' | tr '[:upper:]' '[:lower:]'

The first tr deletes special characters. d means delete, c means complement (invert the character set). So, -dc means delete all characters except those specified. The \n and \r are included to preserve linux or windows style newlines, which I assume you want.

The second one translates uppercase characters to lowercase.