useful ubuntu command....

Movement In The directory

* cd - Change Directory
* pwd - Print Working Directory

Managing Files and Text

* cp - Copy
* ls - List
* mkdir - Make Directory
* mv - Move
* rm - Remove
* grep - Search for Text Strings
* head - Display Start of File
* less - Display Part of File
* more - Display Part of File
* tail - View the End of a File

Managing System and Program Information

* cal - Calendar
* date - Date

Troubleshooting

* fsck - File System Check

Managing Network Connections

* chkconfig - Check Activated Services
* ping - Test Network Connections
* ftp - file Transfer Protocol
* host - Check IP of Domain
* ifconfig - Configure Network Devices
* netstat - Display Routing Table
* route - Set Routes
* telnet - Connect to telnet
* traceroute - Display Route

Manage Drives and Formats

* mount - Mount a Drive
* umount - Unmount Drive
* fdisk - Format Disk
* dd - Dupliate Disk
* df - Disk Free Space

Managing Rights to Files and Directories

* chmod - Change Mode
* su - Switch User

Managing Users and Groups

* passwd - Create Password
* groupadd - Add a Group
* groupmod - Modify a Group
* chgrp - Change Group
* groupdel - Delete Group

* sudo command – Executing Commands with Elevated Privileges