| df | shows free and used disk space |
| top | shows memory usage – updates in real time |
| ps | Process Status – lists running processes |
| ps -ef | show system processes |
| find . -name FILENAME -print | locate a file named FILENAME and show it’s location |
| grep -r “pattern” * | search through all files and subdirectories from the current directory for the given pattern and print matches |
| uname -a | displays the current kernel version |
| lsb_release -a | displays Ubuntu installation version |
| fdisk -l | lists partition info |
Ubuntu/Debian Package Management
Install an app: sudo apt-get install name
Remove: sudo apt-get remove name (‘apt-get remove –purge name’ to remove all config files also)
List installed packages: sudo dpkg –list | more
RPM Commands (Red Hat/Fedora and derivatives)
| rpm -ivh PACKAGE | installs a new RPM |
| rpm -e PACKAGE | uninstalls an RPM |
| rpm -qi PACKAGE | Queries that a package is unstalled and displays information about it |