To modify the blocked IP address, modify file /etc/apf/deny_hosts.rules, then restart the apf daemon “/etc/apf/apf -r”
Statistics R command
. Read a file
height <- read.table("H:/public folder/hzhang/R/height.txt",header=T)
. Print summary
summary(height)
. Set the factor level
height$Treatment <- relevel(height$Treatment, ref="kitaake")
. Variance analysis
summary(lm((height$Height~height$Treatment)))
iptables
* In the text below the single ‘-‘ in front of long option should be double ‘-‘, such as -dport should dash-dash-dport. WordPress messed up with double dashes.
. redirect all traffic destined to port 80 to port 22 only from a specific IP address
iptables -t nat -A PREROUTING -p tcp –dport 80 -s 127.1.1.2 -j REDIRECT –to-ports 22
. redirect all traffic destined to port 80 to port 22 only from a specific MAC address
iptables -t nat -A PREROUTING -p tcp –dport 80 -m mac –mac-source 00:06:5B:95:89:41 -j REDIRECT –to-ports 22
. list all rules in nat table
iptables -t nat -n -L
. delete rule 1 in nat table on PREROUTING chain
iptables -t nat -D PREROUTING 1
RPM command
rpm -qa: list all packages
rpm -qpl packagename: list a specific package name
Install MySQL
Install MySQL
1) remove old package
$ rpm -e –nodeps mysql-3.23.58-9
2) install new packages of server and client
$ rpm -Uvh MySQL-server-4.1.3-1.i386.rpm
$ rpm -i MySQL-client-4.1.3-1.i386.rpm