For a Windows user who recently migrated to Ubuntu Linux, Gnome System Monitor is a similar tool to Windows Task Manager.
Gnome System Monitor (from http://freecode.com/projects/gnome-system-monitor) is a GNOME process viewer and system monitor with a nice easy-to-use interface, It has some nice features, such as a tree view for process dependencies, icons for processes, the ability to hide processes that you don’t want to see, graphical time histories of CPU/memory/swap usage, the ability to kill/renice processes needing root access, as well as the standard features that you might expect from a process viewer.
It is generally available as default to Linux Distribution, else you can install by typing following command in terminal:
$ sudo gnome-system-monitor
You can also run System Monitor from dashboard:
Tip: To view all processes, goto “View” and select “All Processes”:
Tip: If you try too stop./end/kill some processes with gnome system monitor : it gives error: operation is not permitted
solution run it through terminal: sudo gnome-system-monitor
BleachBit from Sourceforge (http://bleachbit.sourceforge.net/features) is a free software which is available for Linux too. It is a diskspace cleaner, privacy manager, and computer optimizer.
BleachBit can be used to:
●Free disk space
●Reduce the size of backups and the time to create them by removing unnecessary files
●Improve system performance (by vacuuming the Firefox database, for example)
●Prepare whole disk images for compression (common for “ghost” backups and virtual machines) by wiping free disk space
List of cleaners available in BleachBit includes Adobe Reader, OpenOffice.org, Google Earth, Bash, Firefox, VLC media player etc.
1. Search BleachBit
$ apt-cache search BleachBit
bleachbit – delete unnecessary files from the system
2. Install BleachBit
$ sudo apt-get install bleachbit
3. Run BleachBit
$ sudo bleachbit
Go to Dashboard and open Screenshot:
If you are running BleachBit by clicking icon on dashboard, then select the root-mode based.
Tip: In Ubuntu: if bleach bit is not showing Folders/Files on Desktop for Shredding with root access. Then, click and select ” show hidden files” now select File System to root directory then home then user directory then try to open Desktop it should work: