<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 98.1p1 release (March 2nd, 1998) originally by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>Command Line Editing</TITLE> <META NAME="description" CONTENT="Command Line Editing"> <META NAME="keywords" CONTENT="vol1"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <LINK REL="STYLESHEET" HREF="vol1.css"> <LINK REL="next" HREF="node34.html"> <LINK REL="previous" HREF="node32.html"> <LINK REL="up" HREF="node31.html"> <LINK REL="next" HREF="node34.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html899" HREF="node34.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html895" HREF="node31.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html889" HREF="node32.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html897" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <A NAME="tex2html898" HREF="node216.html"> <IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="icons.gif/index_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html900" HREF="node34.html">Command Line Suspension</A> <B> Up:</B> <A NAME="tex2html896" HREF="node31.html">Command Syntax</A> <B> Previous:</B> <A NAME="tex2html890" HREF="node32.html">Command Recalling</A> <BR> <BR> <!--End of Navigation Panel--> <H2><A NAME="SECTION00642000000000000000"> </A><A NAME="1675"> </A> <BR> Command Line Editing </H2> <P> The commands in the internal command buffer may also be edited. On Unix systems MIDAS comes (since the 94NOV release) with two different line-editors: <I>TermWindows </I> (the one developed at ESO) and <I>readline</I> (which is from the GNU project). The default line-editor is <I>readline</I> which provides a history stack of commands, <TT>emacs</TT> or <TT>vi</TT> editing functions, command and filename completion functions, and a communication channel to the MIDAS GUI <A NAME="1681"> </A>XHelp for the On-Line Help <A NAME="1682"> </A> utility. See the man page of <TT>readline</TT> for a complete list of options. <BR> To use the old <I>TermWindows</I> line-editor just set the environment variable <TT>TERMWIN</TT> to <TT>yes</TT>. Please, note, that the <I>TermWindows</I> editor will be phased out in a future MIDAS release. <BR> <BR> On VMS systems MIDAS comes only with the <I>TermWindows </I> line-editor. <BR> <BR> To edit a MIDAS command, type the command number preceded by a dot (period) or followed by a dot. So <TT>`.xyz'</TT> or <TT>`xyz.'</TT> will both display the command <TT>`xyz'</TT> and put you into the edit mode where you can modify that command. <BR> If you employ the pattern matching style, use <TT>`.:pattern'</TT> or <TT>`:.pattern'</TT> to edit a previous command containing that pattern. <BR> You edit that line using the <I>arrow</I> keys and <I>delete</I> key of the keyboard and retyping the characters. On VMS systems to toggle between <I>Replace</I> and <I>Insert</I> mode use <TT>CtrlA</TT>. <BR> Using <TT>`.xyz'</TT> (<TT>`.:pattern'</TT>) will lead to the creation of a new MIDAS command with new command number, whereas <TT>`xyz.'</TT> (<TT>`:.pattern'</TT>) modifies the specified command directly (and keeps this command number). <BR> Also the commands recalled via the arrow keys can be edited. <BR> As mentioned above only the 15 most recently used commands are kept in the command buffer on a first-in, first-out basis. So if you repeat or edit a certain command via its MIDAS command-number at least once in 15 command inputs, this command will always be kept in the buffer. <BR> However, you may wish to make sure that a command remains always in the buffer. Entering <TT>`xyz/LOCK'</TT> will lock the command with number <TT>`xyz'</TT> in the buffer; to unlock the command, use <TT>`xyz/UNLOCK'</TT>. <BR> The command <TT>CLEAR/BUFFER</TT> empties the command buffer and resets the command counter to 1. Since 3 digits are used for the command count, the counter is also reset to 1 after MIDAS command no. 999. <P> <HR> <!--Navigation Panel--> <A NAME="tex2html899" HREF="node34.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html895" HREF="node31.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html889" HREF="node32.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html897" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <A NAME="tex2html898" HREF="node216.html"> <IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="icons.gif/index_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html900" HREF="node34.html">Command Line Suspension</A> <B> Up:</B> <A NAME="tex2html896" HREF="node31.html">Command Syntax</A> <B> Previous:</B> <A NAME="tex2html890" HREF="node32.html">Command Recalling</A> <!--End of Navigation Panel--> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-09</I> </ADDRESS> </BODY> </HTML>
