what are wild card characters
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In software, a wildcard character is a kind of placeholder represented by a single character, such as an asterisk, which can be interpreted as a number of literal characters or an empty string.
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" ? " and " * " are wild card characters and they are used when we do not the exact name of any file on our computer. Suppose, the name of your file is " Brainly " and you do not know the entire name of file. Then you may write " ? " in the place of the letter which you do not know, say " Brainl? ". Similarly we can also use " * " but it is used in place of more than one letter, like, " Brai* ".
Therefore, since the use of such characters are already set, they cannot be used in the file name.
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