Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Sending a UTF8 encoded CSV from PHP
Answer:
It is easy to generate a CSV file using the fputcsv function. One of a very common problems is even the file is UTF-8 encoded, Microsoft Excel is still unable to identiy the file as UTF-8.
To solve this, you need to add the UTF-8 BOM to the beginning of the file.
E.g.
<?php
echo "\xEF\xBB\xBF" . $csvdata; // Assume $csvdata contains the CSV string you want to output
Clone a remote Mercurial repository over SSH
Answer:
To clone a remote Mercurial repository over SSH, is easy with the following command.
E.g.
# hg clone ssh://john@remote-host//remote-folder /local-folder
The key is the double slash //
That's it.
Error control operator in PHP
Answer:
The error control operator (the @) is useful to ignore any error messages that might be generated by PHP.
E.g.
<?php
$my_value = @$my_array[$key];
The above statement will not generate any warning even if the index $key doesn't exist.
Render web page using PyQt
Answer:
Qt bindings to WebKit have been added since 4.4, so you can use PyQt to script the browser (Webkit based).
Firstly, make sure you have installed the need packages:
# sudo apt-get install libqt4-core libqt4-webkit python-qt4
Then you can write a simple script to test, e.g.
#!/usr/bin/env python
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtWebKit import *
app = QApplication(sys.argv)
web = QWebView()
web.load(QUrl("http://www.google.com"))
web.show()
sys.exit(app.exec_())
Do not save backup copies of files when doing revert in Mercurial
Answer:
When you want to revert your local changes by executing the command "hg revert filename", Mercurial will save your changes in the file "filename.orig".
To skip this, use the option - "--no-backup"
E.g.
# hg revert --no-backup filename
