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Say you're working in console, but you have a document, say an excel spreadsheet turns up and you want to view it. If you simply type:
gnumeric file.xls
You'll get an error as gnumeric needs a graphical interface, an X server, to display itself.
However, if you know the name of the X server, normally ':0' on single user machines, then you can force gnumeric to display in that server. By typing:
gnumeric --display=:0 file.xls
Then, if you swtich from the text console to the X console, you'll see the spreadsheet displayed in all its glory.
This technique can be used for other applications, such as xpdf (xpdf -display :0 file.pdf) and
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