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imported>ThorstenStaerk |
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| − | bg, fg and jobs are [[process]] related [[commands]] that belong together. bg stands for background and fg stands for foreground.
| + | screenshot showing the default call of a program that goes into the foreground on the example of xclock |
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| − | = Concept =
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| − | When you start a [[program]] under Linux, by default the command runs in the foreground. This means the console is reserved for in- and output to and from this program. You do not get a prompt while the program is running. Here is an example for this showing the program xclock being called by the command
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| − | xclock
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| − | [[File:Snapshot-fg-xclock.png]]
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| − | This program runs in the foreground, the console is reserved for its in- and output. To run the same program in the background, start it with the ampersand ("&") after the program name:
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| − | xclock &
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| − | [[File:Snapshot-bg-xclock.png]]
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| − | In this case you can continue to call further [[commands]] on the console.
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| − | = Hints =
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| − | Maybe you have started a program without the & behind it, and now you want to use console to issue further commands. In this case stop the program using CTRL_Z:
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| − | tweedleburg:~ # xclock
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| − | ^Z
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| − | [1]+ Stopped xclock
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| − | List it using the command jobs
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| − | tweedleburg:~ # jobs
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| − | [1]+ Stopped xclock
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| − | And send it to the background using the command bg
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| − | tweedleburg:~ # bg
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| − | [1]+ xclock &
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| − | tweedleburg:~ #
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| − | Now it will be as if you had called the command with the & behind it. You will be able to use console for issueing further commands.
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| − | = See also =
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| − | * [[disown]]
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| − | * http://www.lehman.cuny.edu/cgi-bin/man-cgi?jobs+1
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| − | [[Category:Concept]]
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Revision as of 09:45, 16 December 2011
screenshot showing the default call of a program that goes into the foreground on the example of xclock
