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<H2><A NAME="SECTION00641000000000000000"> </A> <A NAME="1645"> </A>
<BR>
Command Recalling
</H2>
<P>
By default, the last 15 commands entered on the terminal are kept in an
internal buffer (the no. of commands saved can be changed via <TT>SET/BUFFER</TT>).
To recall (and execute) any of these
commands, simply type the associated command number. This is the number
``xyz'' appearing in the prompt <TT>Midas xyz</TT>> when that
command was entered. To display the command buffer, simply hit
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<BR>
If you want to recall more than one command at once,
enter all the relevant command
numbers (separated by a semicolon and space), e.g. enter <TT>14; 17; 22</TT>
if you
want to repeat the commands numbered 14, 17 and 22 . Also
<TT>14; read/keyw in_a; 17</TT> is possible.
<BR>
<BR>
To recall commands not by number but by pattern, use <TT>:pattern</TT> to repeat
the last command matching the specified pattern. For example, if the last
two commands in your command buffer are:
<P>
<BLOCKQUOTE>
<TT>22 READ/IMAGE supernova <BR>
23 show/commands</TT></BLOCKQUOTE>Then, typing <TT>22</TT> as well as <TT>:READ</TT> or <TT>:nova</TT>
will execute the command
<TT>READ/IMAGE supernova</TT> again. Note that for the pattern matching MIDAS
<I>does</I> make a distinction between upper and lower case.
<BR>
You can also use the vertical arrow keys to navigate up and down through the
command buffer.
<BR>
Besides repeating complete input lines it is also possible to just use parts
of the last command line.
Each ``token''<A NAME="1658"> </A> of the last command line is saved internally until the
next input. A ``token'' is the information separated by spaces in the
command line. To repeat the tokens on a subsequent command line
merely type a `.' For example, if you have in the command buffer:<BLOCKQUOTE>
<TT>READ/KEYWORD in_a <BR>
LOAD/IMAGE myframe 0 2,2 </TT></BLOCKQUOTE>Then typing <TT>` . yourframe . . '</TT> as the next command is equivalent to
typing <TT>`LOAD/IMAGE yourframe 0 2,2'</TT>. <BR>
<BR>
All features described so far apply to genuine MIDAS commands as well as to
host system commands (where the first character of the command line is
the $ sign).
<BR>
<BR>
Some words of caution:
In VMS the version number of files may be specified using a
semicolon, e.g. <BR>
<TT>$ RENAME file.typ;7 lola.bdf</TT>.
<BR>
Typing such a command inside MIDAS will
not work, since the monitor will interpret this input as two Midas commands.
Instead, use a dot to separate the version number, e.g.
<BR>
<TT>Midas 234> $ RENAME file.typ.7 lola.bdf</TT>.
In Unix the repetition of tokens may cause trouble. Consider the following:
<BR>
<TT>Midas 123> load/image vaca</TT> <BR>
<TT>Midas 124> $cp /elsewhere/toro.bdf . </TT> <BR>
The intention was to simply copy the file <TT>toro.bdf</TT> from somewhere else to
the current directory. But instead of <TT>toro.bdf</TT> you will find a
strange file named <TT>?</TT> in your directory...
<BR>
In the line `123' only two tokens are entered, so all other 8 tokens are
set to the default value <TT>`?'</TT>. In line `124' the third token will be set
to the third token in the line above, so it changes to:
<BR>
<TT>Midas 124> $cp /elsewhere/toro.bdf ? </TT> <BR>
Instead, specify also the result frame completely, e.g.
<BR>
<TT>$cp /elsewhere/toro.bdf toro.bdf</TT>.
Preceding a host command by $$ disables the interpretation of specific
symbols by MIDAS, thus
<BR>
<TT>Midas 124> $$cp /elsewhere/toro.bdf . </TT> <BR>
will actually do the expected copy.
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-09</I>
</ADDRESS>
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