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======
Tailer
======
.. image:: https://travis-ci.org/six8/pytailer.svg
:target: https://travis-ci.org/six8/pytailer
:alt: Build Status
Python tail is a simple implementation of GNU tail and head.
It provides 3 main functions that can be performed on any file-like object that supports ``seek()`` and ``tell()``.
* ``tail`` - read lines from the end of a file
* ``head`` - read lines from the top of a file
* ``follow`` - read lines as a file grows
It also comes with ``pytail``, a command line version offering the same functionality as GNU tail. This can be particularly useful on Windows systems that have no tail equivalent.
- `Tailer on GitHub <http://github.com/six8/pytailer>`_
- `Tailer on Pypi <http://pypi.python.org/pypi/tailer>`_
Installation
============
Install with ``pip`` or ``easy_install``.
::
pip install tailer
Examples
========
::
import tailer
f = open('test.txt', 'w')
for i in range(11):
f.write('Line %d\\n' % (i + 1))
f.close()
Tail
----
::
# Get the last 3 lines of the file
tailer.tail(open('test.txt'), 3)
# ['Line 9', 'Line 10', 'Line 11']
Head
----
::
# Get the first 3 lines of the file
tailer.head(open('test.txt'), 3)
# ['Line 1', 'Line 2', 'Line 3']
Follow
------
::
# Follow the file as it grows
for line in tailer.follow(open('test.txt')):
print line
Running Tests
=============
Tailer currently only has doctests.
Run tests with nose::
nosetests --with-doctest src/tailer
Run tests with doctest::
python -m doctest -v src/tailer/__init__.py