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    1 \chapter{The command line interface}
    2 \label{chap:cli}
    4 The gretl package includes the command-line program \app{gretlcli}.
    5 On Linux it can be run from a terminal window (xterm, rxvt, or
    6 similar), or at the text console.  Under MS Windows it can be run in a
    7 console window (sometimes inaccurately called a ``DOS box'').
    8 \app{gretlcli} has its own help file, which may be accessed by typing
    9 ``help'' at the prompt. It can be run in batch mode, sending output
   10 directly to a file (see also the \GCR).
   12 If \app{gretlcli} is linked to the \app{readline} library (this is
   13 automatically the case in the MS Windows version; also see
   14 Appendix~\ref{app-build}), the command line is recallable and
   15 editable, and offers command completion.  You can use the Up and Down
   16 arrow keys to cycle through previously typed commands.  On a given
   17 command line, you can use the arrow keys to move around, in
   18 conjunction with Emacs editing keystrokes.\footnote{Actually, the key
   19   bindings shown below are only the defaults; they can be customized.
   20   See the
   21   \href{http://cnswww.cns.cwru.edu/~chet/readline/readline.html}{readline
   22     manual}.} The most common of these are:
   23 %    
   24 \begin{center}
   25   \begin{tabular}{cl}
   26     \textit{Keystroke} & \multicolumn{1}{c}{\textit{Effect}}\\
   27     \verb+Ctrl-a+ & go to start of line\\
   28     \verb+Ctrl-e+ & go to end of line\\
   29     \verb+Ctrl-d+ & delete character to right\\
   30   \end{tabular}
   31 \end{center}
   32 %
   33 where ``\verb+Ctrl-a+'' means press the ``\verb+a+'' key while the
   34 ``\verb+Ctrl+'' key is also depressed.  Thus if you want to change
   35 something at the beginning of a command, you \emph{don't} have to
   36 backspace over the whole line, erasing as you go.  Just hop to the
   37 start and add or delete characters.  If you type the first letters of
   38 a command name then press the Tab key, readline will attempt to
   39 complete the command name for you.  If there's a unique completion it
   40 will be put in place automatically.  If there's more than one
   41 completion, pressing Tab a second time brings up a list.
   43 Probably the most useful mode for heavy-duty work with \app{gretlcli}
   44 is batch (non-interactive) mode, in which the program reads and
   45 processes a script, and sends the output to file.  For example
   46 \begin{code}
   47 gretlcli -b scriptfile > outputfile
   48 \end{code}
   50 Note that \textsl{scriptfile} is treated as a program argument; only
   51 the output file requires redirection (\verb|>|).  Don't forget the
   52 \texttt{-b} (batch) switch, otherwise the program will wait for user
   53 input after executing the script (and if output is redirected, the
   54 program will appear to ``hang'').
   57 %%% Local Variables: 
   58 %%% mode: latex
   59 %%% TeX-master: "gretl-guide"
   60 %%% End: