Linux common commands and shutting down firewalls

2. Common Linux Commands

Mkdir Create

RM-RF Delete

Chmod-r 777 Permissions

Mysql-uroot-r

Quit quitting

Find/-name SVN lookup location

3. Turn off the firewall and SELinux

Redhat uses SELinux to enhance security and shuts down by:

1. Permanent effect

Modify the Selinux= "" in the/etc/selinux/config file to Disabled, and then restart.

2. Immediate effect

Setenforce 0

The way to turn off the firewall is:

1. Permanent entry into force

Open: Chkconfig iptables on

OFF: Chkconfig iptables off

2. Immediate effect, failure after reboot

Open: Service iptables start

Close: Service iptables stop

It is necessary to note that for other services under Linux, the above command can be used to perform the open and close operations.

Add:

A. Firewalls also need to shut down the IPv6 firewall:

Chkconfig Ip6tables off

And you can view the status with the following command:

Chkconfig--list iptables

B. The SELinux status can be viewed through the following commands:

Sestatus

===============

# uname-a # View kernel/Os/cpu information
# head-n 1/etc/issue # view OS version
# cat/proc/cpuinfo # View CPU Information
# hostname # View computer name
# LSPCI-TV # list all PCI devices
# LSUSB-TV # list all USB devices
# lsmod # List of loaded kernel modules
# env # View environment variable resources
# free-m # View memory usage and swap area usage
# df-h # View the usage of each partition
# du-sh < directory name > # View the size of the specified directory
# grep Memtotal/proc/meminfo # View Total Memory
# grep Memfree/proc/meminfo # View the amount of free memory
# uptime # View System uptime, number of users, load
# cat/proc/loadavg # View system load disks and partitions
# Mount | COLUMN-T # Viewing the status of a mounted partition
# fdisk-l # View all partitions
# swapon-s # View all swap partitions
# hdparm-i/dev/hda # View disk parameters (for IDE devices only)
# DMESG | grep IDE # View IDE device detection network at startup
# ifconfig # View the properties of all network interfaces
# iptables-l # View firewall settings
# route-n # View the routing table
# netstat-lntp # View all listening ports
# NETSTAT-ANTP # View all established connections
# netstat-s # View the network statistics process
# ps-ef # View All Processes
# top # Real-time display of process status users
# w # View active Users
# ID < user name > # view specified user information
# last # View user log in log
# cut-d:-f1/etc/passwd # View All users of the system
# cut-d:-f1/etc/group # View all system groups
# crontab-l # View the current user's scheduled tasks service
# chkconfig–list # List all system services
# Chkconfig–list | grep on # Lists all started system services programs
# rpm-qa # View all installed Packages

Linux common commands and shutting down firewalls