Programming | Linux Ask!

Downgrade the format of a Subversion working copy

Advanced Linux, Programming 2 Responses »

Aug 192010

Downgrade the format of a Subversion working copy

Answer:

Sometimes, when you upgraded the local subversion working copy, but others use an older client to access it, error likes "This client is too old to work with working copy..." will appear.

To fix this, you can consider downgrade the format of the subversion working copy.

E.g. Downgrade to 1.4

# change-svn-wc-format.py /path/to/working/copy 1.4

The useful python script can be downloaded here: http://svn.apache.org/repos/asf/subversion/trunk/tools/client-side/change-svn-wc-format.py

A simple array in Perl

Perl 1 Response »

Aug 162010

A simple array in Perl

Answer:

Array is a list like data structure in Perl. It allows you to access to the elements inside the array sequentially.

Example:

use strict;
use warnings;

my @a = (1, 2, 3);

print $a[2]; # print '3', since Perl array is zero-indexed

Multi-line string in Ruby

Ruby No Responses »

Aug 152010

Multi-line string in Ruby

Answer:

To declare a multi-line string in Ruby, it is as easy as the following.

sql = "
        SELECT *
            FROM `user` AS u
            JOIN `company` AS c
                ON u.cid = c.id
             WHERE u.id = 8
"

puts sql

Cross platform newline in PHP

PHP No Responses »

Aug 122010

Cross platform newline in PHP

Answer:

In PHP, if you want to print out a newline character, you can use the "\n" character

<?php

    echo "Hello World\n";

But the \n" character only work in Linux/UNIX, to make it work for both Windows, Mac and Linux/UNIX platforms, you can use a special constant PHP_EOL.

<?php

    echo "Hello World" . PHP_EOL;

Update the Channel List using PHP/PEAR

PHP No Responses »

Aug 092010

Update the Channel List using PHP/PEAR

Answer:

PEAR is a framework and distribution system for reusable PHP components. To update the channel list, what you need to do is type the following command.

# sudo pear channel-update pear.php.net

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