write wall ping ifconfig mail last traceroute netstat setup mount

************write****** write root1 ************wall******wrtie all wall messasdfaf ***************ping******** ping -c 10 192.168.1.1 ***************ifconfig******** yum install wget yum install net-tool ifconfig ***************mail******** yum -y install sendmail mail root /mail ***************last******** last cat /etc/passwd lastlog -u 502 ***************traceroute******** yum install traceroute -y traceroute www.sina.com.cn ***************netstat******** -t :tcp -u :udp -l :listen -r :route -n :ip,port ****listen port netstat -tlun ****net connect netstat -an ****route list netstat -rn ***************setup******** yum install setuptool service network restart ***************mount******** mkdir /mnt/cdrom mount /dev/sr0 /mnt/cdrom umount /dev/sr0