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Newline = new line, as simple as that. it means that theres no new line after the last line of your code. Your application expects to find a new line after every line and when it doesnt it issues a warning.
It means that theres no new line after the last line of your code
I meant the text file you are reading from.
In other words
An End Of Line character in linux is the 0x0A. The end of file marker is CTRL-Z character. NO newline at end of file means there isn't a EOL character between the last character of text and the end of file marker.
Everytime you press the Enter key a 0x0A character is placed in the file. This tells the editor to move the cursor to the beginning of the next line.