% @(#)vaxx.hlq	17.1.1.1 (ESO-IPG) 01/25/02 17:43:56 
%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
%.COPYRIGHT  (c)  1990 European Southern Observatory
%.IDENT      vaxx.hlq
%.AUTHOR     KB, IPG/ESO
%.KEYWORDS   MIDAS, help files, $/
%.PURPOSE    On-line help file for the command: $/
%.VERSION    1.0  17-OCT-1983 : Creation, KB
%.VERSION    1.1  21-JUN-1991 : Update, KB
%.VERSION    1.2  18-FEB-1992 : add support of C-shell, KB
%.VERSION    1.3  15-JUL-1992 : add `$$' for passing line as it is to host, KB
%----------------------------------------------------------------
\noqualifier
\se
SECTION./
\es\co
$							15-JUL-1992  KB
\oc\su
$ comnd
	execute a host system command
\us\pu
Purpose: 
         Execute a host (operating system) command. Currently supported
         host systems are VAX/VMS and all major UNIX systems.
\up\sy
Syntax:  
         $ host-comnd
\ys\pa
         host-comnd = a UNIX (Bourne-shell) or VMS (DCL) command to be executed
\ap\sa
See also:
         SET/MIDAS_SYSTEM 
\\
         Chapter 3 of the MIDAS Users Guide, Vol. A
\as\ no
Note: 
         Before passing the command line to the host system all substitutions
         of MIDAS are performed. If you want to pass the line "as it is",
         use: $$ host-comnd .
\\
         But note, that the $$ command only works interactively...
\on\exs
Examples:
\ex
         $ date
          Get the current time in UNIX.
\xe\ex
         $ show time
          Get the current time in VMS.
\xe\ex
         $$ cp /rio/grande/elpaso.bdf .
          In Unix, copy the file elpaso.bdf in directory /rio/grande to current
          directory with same name.
          If only a single `$' would be used the name of the new file would
          depend upon the contents of the preceding line, a name like `?' is
          quite likely...
\xe\ex
         $$ delete [rio.grande]elpaso.bdf;*
          In VMS, delete the file elpaso.bdf in directory [rio.grande].
          Again, a single `$' would lead to a VMS error message, since the
          line would be split up into 2 MIDAS commands...
\xe \sxe