nLines not working

[wesleymv]

I am trying to use the nLines option, but it does not seem to work. When the file is modified, it brings more than one line.

Here is the code I am using:

Tail = require('tail').Tail;

tail = new Tail("C:/Users/pc/Desktop/watchfile/1.log", {nLines: 1});

tail.on("line", function(data) {
  console.log(data);
});

tail.on("error", function(error) {
  console.log('ERROR: ', error);
});

When it starts, it brings one line. But, brings many lines when file is modified.

I am sorry if this is just the wrong use of the library.

Thank you in advance

[lucagrulla]

Hello @wesleymv

nLines gives you the starting point. If more lines are appended to the file, they will be then emitted.

Are the multiple lines tailed when the file changes new lines? Or are lines from the file before start tailing the file?

[wesleymv]

Hi @lucagrulla

The lines I get are in the old file. For example, 1.log contains:

1
2
3

when I add 4, this is the output:

31
2
3

if I remove the nLines and run the same steps (seems to omit last line):

1
2
3

[lucagrulla]

How are lines added?

The underline NodeJS core library is sometimes platform dependent. Are the new lines added via an app, like notepad, or with a different mechanism?

On Wed, 21 Jul 2021 at 18:45, wesleymv @.***> wrote:

Hi @lucagrulla https://github.com/lucagrulla

The lines I get are in the old file. For example, 1.log contains: 1 2 3

when I add 4, this is the output:

31 2 3

if I remove the nLines and run the same steps (seems to omit last line):

1 2 3

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[lucagrulla]

Fixed with v2.2.4