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17 lines (8 sloc) 294 Bytes
#!/bin/bash
var0=`ps aux|awk '/dhclient wlan0/'|awk '$11!="awk"{print $2}'`
kill $var0
cp ifcfg-wlan0 /etc/sysconfig/network-scripts/
dhclient wlan0
var1=`ifconfig wlan0 |awk '/inet/{print $2}'|awk -F: '{print $2}'`
rm -f /etc/sysconfig/network-scripts/ifcfg-wlan0
echo "get ip: $var1"