49 lines
1.9 KiB
HTML
49 lines
1.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
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<TITLE>The Linux keyboard and console HOWTO: Screen dumps</TITLE>
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<LINK HREF="Keyboard-and-Console-HOWTO-21.html" REL=next>
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<A HREF="Keyboard-and-Console-HOWTO-21.html">Next</A>
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<A HREF="Keyboard-and-Console-HOWTO.html#toc20">Contents</A>
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<HR>
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<H2><A NAME="s20">20. Screen dumps</A></H2>
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<P>
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<!--
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console!screenshots, obtaining
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-->
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<!--
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screenshots!obtaining from console
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-->
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<P><CODE>setterm -dump</CODE> <I>N</I> will dump the contents of the
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screen of <CODE>/dev/tty</CODE><I>N</I> to a file <CODE>screen.dump</CODE>
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in the current directory. See setterm(1).
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<P>The current contents of the screen of <CODE>/dev/tty</CODE><I>N</I>
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can be accessed using the device <CODE>/dev/vcs</CODE><I>N</I>
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(where `vcs' stands for `virtual console screen').
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For example, you could have a clock program that displays the
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current time in the upper right hand corner of the console screen
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(see the program <CODE>vcstime</CODE> in <CODE>kbd-1.04.tar.gz</CODE>).
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Just dumping the contents goes with <CODE>cat /dev/vcs</CODE><I>N</I>.
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These device files <CODE>/dev/vcs</CODE><I>N</I> do not contain
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newlines, and do not contain attributes, like colors. From a program
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it is usually better to use <CODE>/dev/vcsa</CODE><I>N</I>
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(`virtual console screen with attributes') instead - it starts with
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a header giving the number of rows and columns and the location
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of the cursor.
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See vcs(4).
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<P>
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