how to set up wireless linux by commands

wireless_linux.txt

# Check that the wireless device is up 
ip link show wlan0

# wlan0 UP
ip link set wlan0 up

ip link show wlan0

# Check the connection status
iw wlan0 link

# Scan wireless network

iw wlan0 scan

# Connect to WPA/WPA2 network
wpa_passphrase network >> /etc/wpa_supplicant.conf <enter>
(write network password)

# Run wpa_supplicant with new configuration
wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant.conf

-B run wpa_supplicant means the backgound.
-i Wireless interface


# Check the connectio again
iw wlan0 link

# Obtain ip address by DHCP
dhclient wlan0