Linux - Commands

Linux - Command for creating User
useradd <username>
passwd <username>
then type new password

Command to find ip address of linux box
sudo /sbin/ifconfig or ifconfig

Command to check open port
Linux :
netstat -ano | grep "1521" 

Windows : 
netstat -ano | find "1521"

Linux - Command to set bash path
export PATH=/usr/bin:/usr/sbin:/bin

Command to change Unix password
To change the root password:
sudo passwd
To change your user password:
passwd
To change other users password:
sudo passwd USERNAME

Creating jar/zip/unzip/tar file in Linux
Command for creating jar file in linux :
JAR: jar cvf <jar_name> <Java_file>
untar: tar -xvzf <file_name>.tar.gz
tar: tar -cvzf <file_name>.tar.gz

Linux - Command to set bash path
export PATH=/usr/bin:/usr/sbin:/bin
export ORACLE_HOME=/app/MIddleware/oracle/dbhome_1/11.0.4/