Common commands in Linux Environment

osc_ b0i5ef6e 2021-01-21 10:40:47
common commands linux environment

1、 see 、 Install and uninstall software
1.1、 View installed software (.rpm)

[root@xxx]$ rpm -qa | grep jdk

1.2、 Uninstall the installed software

[root@xxx]$ rpm -e softwarename --nodeps
[root@xxx]$ yum -y remove softwarename

1.3、 Install the software

[root@xxx]$ rpm -ivh *.rpm
[root@xxx]$ yum -y install lrzsz
[root@xxx]$ yum -y install firefox

2、 Find replacement command
2.1、 Mass replacement

sed -i 's/ Replaced string / Replaced string /g' Contains the path to the replaced string file

3、 Network settings
3.1、 Setting up ip

[root@xxx]$ vi /etc/sysconfig/network-scripts/ifcfg-ethXX

3.2、 Restart NIC

[root@xxx]$ service network restart
[root@xxx]$ /etc/init.d/network restart

4、 Firewall operation
4.1: View fire protection status

[root@xxx]$ systemctl status firewalld

4.2: Turn off the firewall temporarily

[root@xxx]$ systemctl stop firewalld

4.3: Permanently shut down firewall

[root@xxx]$ systemctl disable firewalld

4.4: service iptables restart

[root@xxx]$ systemctl enable firewalld

5、jdk Environment variable configuration :

[root@xxx]$ vi /etc/profile
export JAVA_HOME=/usr/local/jdk1.8.0_221
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tool.jar

jdk Environment variable configuration takes effect :

[root@xxx]$ source /etc/profile 

6、linux Environmental Science oracle11g Installation tutorial
User group 、 User creation and oracle Please refer to the table of contents
The installation process and bug Repair reference Tencent classroom wind brother oracle11g setup script
6.1、oracle Data instance 、 Monitoring operations
6.1.1、su - oracle user - Log in to the database

[oracle11@xxx]$ sqlplus "/as sysdba"

6.1.2、 View the database instance name and status

SQL> select instance_name,status from v$instance;

6.1.3、 Close the database

SQL> shutdown immediate;

6.1.4、 Exit database

SQL> exit;

6.1.5、 Check the listening status

[oracle11@xxx]$ lsnrctl status

6.1.6、 Turn on monitoring

[oracle11@xxx]$ lsnrctl start

6.1.7、 lsnrctl stop

[oracle11@xxx]$ lsnrctl stop

7、 user 、 User group creation
7.1、 Create user ( Add users to user groups )、 User groups and setting user passwords

useradd username
useradd -g groupname username 
passwd username
groupadd groupname

7.2、 Add users to groups
Incrementally add groups , What is already useful is not affected

usermod -a -G groupA user

Leave the group you already have , Just as a member of the new group

usermod -G groupA

View the user's group

groups user
cat /etc/group

Authorized Directory ( file ) To designated groups and users

chown -R username:usergroup directory
chown username:usergroup file

7.3、 View user information
To view the user UID and GID Information

id username

View a list of all currently logged in users


View the account name of the current login user

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