sudo apt-get -y install php5-xsl graphviz php-pear unison

dpkg-reconfigure: unable to re-open stdin: No file or directory

export LANGUAGE=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
locale-gen en_US.UTF-8
dpkg-reconfigure locales

sudo apt-get -y install php5-xsl graphviz php-pear unison 2> /dev/null

sudo apt-get -y install php5-xsl graphviz php-pear unison &> /dev/null

sudo apt-get -y install php5-xsl graphviz php-pear unison > /dev/null 2>&1

sudo apt-get -y install php5-xsl graphviz php-pear unison 1> /dev/null 2>&1

$ ls -l /dev/std*
lrwxrwxrwx 1 root root 15 Apr 18 19:03 /dev/stderr -> /proc/self/fd/2
lrwxrwxrwx 1 root root 15 Apr 18 19:03 /dev/stdin -> /proc/self/fd/0
lrwxrwxrwx 1 root root 15 Apr 18 19:03 /dev/stdout -> /proc/self/fd/1