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I could connect to the Raspberry Pi with my Wi-Fi dongle to my home network easily, but I couldn't connect to the university network which is public. Is there any change in configuration setup file (/etc/network/intertfaces) My file consists of:

auto lo
iface lo inet loopback
iface etho inet dhcp

allow-hotplug wlan0
auto wlan0
iface wlan0 inet dhcp
        wpa-ssid "myssid"
        wpa-psk "pwd"
2

You'll need want /etc/network/interfaces. You'll have to use wpa_supplicant in that case. It'll make your life easier.

/etc/network/interfaces

allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

Then, in your /etc/wpa_supplicant/wpa_supplicant.conf file, simply add your WiFi configuration(s). I'm sure it's easy to follow.

/etc/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="Superbly secure WPA home network"
    psk="correctHorseBatt3ry5taple42"
    proto=RSN
    key_mgmt=WPA-PSK
    pairwise=CCMP TKIP
    group=CCMP TKIP
}

network={
        ssid="Horribly insecure open school network"
        key_mgmt=NONE
}

Take note that the SSID is case-sensitive.

1

afaik you don't need the /etc/network/interfaces for connecting to open wifi hotspots.

All you need is a few programs from wireless-tools:

Scan for access points: iwlist wlan0 scan

Now get the ESSID for the access point you want to connect to

Connect to it: ifconfig wlan0 essid ap_name

and get dhcp data(ip, dns, etc.): dhclient wlan0

now you should be connected. You may have to adjust wlan0 to the name of your adaptor.

Beware that most schools/universities have a MAC access filter and you maybe won't be able to get internet connection.

EDIT: If you try to connect to an university wifi, maybe they have 802.1x auth, then try this (it's german, but not difficult to understand, you may try Google Translator ;) )

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