Raspberry Pi Hints And Tips

Actually, none of this is Pi specific but I have found that some friends have bought Pis but not had any previous experience with Linux so here are some notes I wrote for them.

To update the OS and applications and then clean up the install :
sudo apt-get update; sudo apt-get /y upgrade; sudo apt-get autoremove

To find out how much disk and memory space is used/available :
df -h; free -m

How to send an email from the command line :
echo -e "Subject: Test Mail\r\n\r\nThis is a test mail" |msmtp --debug --from=default -t destination@EmailAddress

How to add a new user :
sudo adduser username
sudo visudo
Add following line under the "root ALL=(ALL) ALL" Line:
username ALL=(ALL:ALL) NOPASSWD: ALL

You should delete the default user (user:raspberry, passwd:pi). How to delete a user :
Ensure you have backed up any important information then enter :
sudo deluser --remove-home username

How to change the hostname (e.g. from raspberrypi to donkey) :
sudo nano /etc/hostname
Change raspberrypi to donkey
sudo hostname donkey
nano /etc/hosts
change :
127.0.1.1       raspberrypi
to
127.0.1.1       donkey

Install Apache web server :
sudo apt-get install apache2 php5 libapache2-mod-php5

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