read a string from a file
file descriptor or filename
The ReadString(file) command reads a whitespace delimited string from file.
If file is the name of a file that has not been opened, Maple attempts to open the file before reading the character.
An error is raised if file is not a valid descriptor or if it is the name of a file that cannot be opened.
If the end of the file has been reached, ReadString returns NULL. To determine if the end of file has been reached, use AtEndOfFile.
FileToolsTextWriteString⁡testfile,This is a test
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