Check if a file ends with newline

The following command will return 1 if the file ends with a newline, and 0 otherwise:

tail -c1 <file> | wc -l

Or as a function:

function file_ends_with_newline() {
  [[ $(tail -c1 "$1" | wc -l) -gt 0]]
}

Sources

• https://stackoverflow.com/a/25749716