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1- Top Command
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When you are familiar with
Task Manager in the
Windows OS, you will wonder if there is something similar to
Task Manager in
Ubuntu Server or not.
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In
Windows,
Task Manager is a utility program allowing you to know which application is running on the system and resources it uses
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Ubuntu supplies you with a similar program, however its interface is very rudimentary. The application is called as
"Top Command".
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To run
"Top Command", you run the
top command:
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Top Command:
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Note: To exit
"Top Command", press
'q'.
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2- Show Helps
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You need press
'h' to see Helps, and press "ESC" to return to the main screen.
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3- Add/remove Fields
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There are lots of Fields you can care for. By default,
"Top Command" only displays some Fields. Press
'f' to add or remove Fields:
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The Fields with (*) are the displayed fields, other ones don't display on
"Top Command".
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Use up or down arrow keys to move to the the desired Field.
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- Press ENTER.
- Press Whitespace to select or deselect Field.
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Press
"ESC" to return to the main screen.
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4- Change the order of the Fields
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It will be more visible when you change the order of the Field on the screen of the
"Top Command".
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Press
'f' to see a list of Fields.
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- Press the right arrow key to mark the Field that need to move.
- Press the up/ down arrow to move the Field marked above to another location.
- Press ENTER to complete it.
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Press "ESC" to return to the main screen.
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5- Sort on Field
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Assume that you want to know which program is using the most memory, you need to sort it by
%MEM (% Memory).
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Press
'f' to see the list of Fields.
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- Select the Field to sort.
- Press 's'.
- Press "ESC" to return to the main screen.
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6- Sort by CPU
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CPU is an important field, it tells you which Process enables computer to process the most at the moment. Press
"Shift + P" to sort by CPU.
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7- Display Specific User Processes
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Use the option
'-u' allowing you to specify user and to view which process is executed by this user.
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For example, see the processes that are executed by user 'tran':
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8- Highlight Running Processes
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Press 'z', the program
"Top Command" will display processes running with the colors. This helps you to identify the running processes easily.
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9- Shows Absolute Path of Processes
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When the processes are running, if you want to see the absolute path of the files that execute those processes, you need to press
'c':
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10- Kill a process
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In
Windows, you can finish a running task by using
"End Task".
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On
Ubuntu, you can use
"kill" to kill a process.
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- Press 'k'.
- Enter PID (Process ID).
- Press ENTER.
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