Category Archives: How to

How to enable/disable Android logcat when using a custom kernel

A good source of information could be found in this page, but none of them worked for me.

The most useful article I found was on xda and here’s the solution:

  • enable
    echo 0 > /sys/module/logger/parameters/log_mode
  • enable at boot, but not when suspended
    echo 1 > /sys/module/logger/parameters/log_mode
  • completely disabled:
    echo 2 > /sys/module/logger/parameters/log_mode

(you need a rooted device)

How to compile rsync for Android in Ubuntu

My situation

My machine

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04 LTS
Release:    14.04
Codename:   trusty

The latest rsync version to compile (for me it was rsync-3.1.0.tar.gz)

$ curl -s \
    | sed -r 's/^.*href="([^"]*)".*$/\1/' | grep 'rsync-[0-9].*\.tar\.gz$'


  1. save the tarball name in a variable
    $ RSYNCTGZ="rsync-3.1.0.tar.gz"
  2. install needed software
    $ sudo aptitude install gcc-arm-linux-gnueabi
  3. download sources
    $ wget$RSYNCTGZ
    $ tar xzf $RSYNCTGZ
    $ cd rsync-[0-9]*
  4. compile
    $ ./configure --host=arm-linux-gnueabi CFLAGS=-static
    $ make
  5. install on the device
    $ adb push rsync /data/local/tmp && adb shell chmod 775 /data/local/tmp/rsync
  6. test execution
    $ adb shell /data/local/tmp/rsync


How to display PHP errors only in public_html directories

How to display PHP errors

I always use servers where PHP errors are not shown by default and I always forget how to enable error messages in development environments.

My situation

On a server I usually prefer Debian OS, but when I develop on the go I use laptops with Ubuntu.
In this case I’m running Ubuntu 14.04 LTS with Apache2 (v2.4.7) and libapache2-mod-php5 (v5.5.9).

I want PHP errorors displayed for projects in my public_html folder.

Solution 1 (only Apache conf files)

Create the file /etc/apache2/sites-enabled/800-public-html.conf with this content:

<Directory /home/*/public_html>
  AllowOverride Options
  php_admin_flag display_errors On

Solution 2 (using .htaccess)

Create the file /etc/apache2/sites-enabled/800-public-html.conf with this content:

<Directory /home/*/public_html>
  AllowOverride Options

Create the file /home/max/public_html/project1/.htaccess with this content:

php_admin_flag display_errors On


It’s easy and easily forgettable. Don’t forget to add

error_reporting(E_ALL | E_NOTICE);

in your .php files.