## download and install phar-composer
$ wget https://github.com/clue/phar-composer/releases/download/v1.0.0/phar-composer.phar
$ chmod 755 phar-composer.phar
$ sudo mv phar-composer.phar /usr/local/bin/phar-composer

## test executable
$ phar-composer --version

## Now test usage by "Eating your own dogfood"
$ phar-composer install clue/phar-composer

## the result should be the reinstallation of the previous installed phar-composer
## (after you need to give the sudo password)

## now try installing mageconfigsync
$ phar-composer install punkstar/mageconfigsync:dev-release/0.5.0

## test executing mageconfigsync for command help
$ mageconfigsync