Linux common commands and configuration--simple

1, File Search:

Find JDK path: which jdk; query Java_home variable value: Echo $JAVA _home

From the root directory, look for all text files with a. log extension and find the line that contains "ERROR"
Find/-type f-name "*.log" | Xargs grep "ERROR"

The system immediately displays httpd.conf file information on the screen after finding the httpd.conf file.
Find/-name "httpd.conf"-ls

Find a file under the root directory
Find. -name "Test"

Find a file in a directory that contains a string in the content

Grep-r "ZH_CN".

2, Process

View Java's process information: Ps-ef|grep java

Kill process: kill-9 process number

3, network configuration

File path:/etc/sysconfig/network-scripts/ifcfg-eth0

Reference: http://blog.csdn.net/clevercode/article/details/46376985

NIC configuration static IP
1) Edit the configuration file, add the following content to modify
# Vi/etc/sysconfig/network-scripts/ifcfg-eth0

Bootproto=static #启用静态IP地址
Onboot=yes #开启自动启用网络连接
ipaddr=192.168.21.129 #设置IP地址
netmask=255.255.255.0 #设置子网掩码
gateway=192.168.21.2 #设置网关
dns1=8.8.8.8 #设置主DNS
dns2=8.8.4.4 #设置备DNS
Ipv6init=no #禁止IPV6
: wq! #保存退出

2) After the modification, execute the following command
# Service Ip6tables Stop #停止IPV6服务
# chkconfig Ip6tables off #禁止IPV6开机启动
# Service Network Restart #重启网络连接

# ifconfig #查看IP地址

4, Firewall

File path:/etc/sysconfig/iptables

Reference Configuration Examples:

*filter:input Accept [0:0]:forward Accept [0:0]:output Accept [0:0]-a input-m State--state established,related-j ACCEPT  -A INPUT -p icmp -j ACCEPT-A INPUT -i lo -j ACCEPT-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT-A INPUT -P tcp-m State--state new-m TCP--dport 1180:19090-j accept-a input-p udp-m State--state new-m UDP--dport 1180:1 9090-j accept-a input-j REJECT--reject-with icmp-host-prohibited-a forward-j REJECT--reject-with icmp-host-prohibited COMMIT

Note: 1180:19,090 indicates that ports between 1180 and 19090 are all open

Firewall settings take effect (restart before save)

Service Iptables Restart/etc/init.d/iptables Save

Set Iptables auto-start

Chkconfig iptables on

also view and delete iptables rule methods : http://blog.51yip.com/linux/1404.html

5, Environment variables
Vi/etc/profile

Linux common commands and configuration--simple