Linux & Systems

Big endian - most significant byte stored in smallest address, read from left to right. Let’s take a 32-bit value : 0x09080706 : 09|08|07|06 byte address : x|x+1|x+2|x+3 For example 32-bit value 5 writing as 0x00000005 is a Big endian. Little endian - least significant byte is stored in smallest address, read from right to left. 32-bit value would be stored in memory in following way : 0x09080706 : 06|07|08|09 byte address : x|x+1|x+2|x+3 For example little endian value would be 16-bit value **53 **in 0x3500 ...

Scanning for wifi networks : ifconfig wlan0 up scan Setting up your wifi device :Network-Wireless This example shows the Atheros ath0 wireless adapter.Add an entry for this network to /etc/wpa_supplicant.conf. If the file does not exist, create it. Replace myssidand mypsk with the SSID and PSK provided by the network administrator. network={ ssid=“myssid” psk=“mypsk” } Add entries to /etc/rc.conf to configure the network on startup: wlans_ath0=“wlan0” ifconfig_wlan0=“WPA SYNCDHCP” Restart the computer, or restart the network service to connect to the network: # service netif restart After 8.0v, it is necessary to create a wlan clone device of the actual wifi card : # ifconfig wlan0 create wlandev ath0 # ifconfig wlan0 up list scan

**APT-GET ** In case if your access is going through proxy server you need to provide the credentials to APT. Just create an apt.conf file in /etc/apt/ and add there the following entry : Acquire::http::Proxy “http://proxyadd:port”; In case if authentication is needed : Acquire::http::Proxy “http://username:password@proxyadd:port”; **YUM ** /etc/yum.conf proxy=http://proxyadd:port proxy_username=user proxy_password=passwd