it does remove some illegal characters (<>|*?) from the name that obviously should not occur in a file name

Those are all perfectly valid characters in many *NIX OSes, see e.g. this. I also don't understand why some of those characters are simply removed and others cause the string to be cut off at that point.

Okay, I was told earlier that when we open a file such as open FILEHANDLE, "< $FILE_NAME" then it's a good idea to make sure that $FILE_NAME does not contain any special characters such as | > < because it's a potential vulnerability, especially if you get your file name from some other place like arguments. Your script could be hacked, and it may end up doing something you didn't want.. That's why I check the file name.

Also, there is no point in doing this : open FILEHANDLE, "< *.*" so again those special characters should not appear in that space. It's perfectly okay to include them when you do a search, but not when you're trying to open a file for reading.

In reply to Re^3: Usage of File Handles by harangzsolt33
in thread Usage of File Handles by catfish1116

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