10.2.2. - Argument substitution
The argument-substitution feature lets you pass arguments to the command file, making it possible to vary parameters each time you use the file. As C-PLOT reads the file, strings in the command file of the form
$1, $2 and so on will be replaced
by arguments entered with the
do command.
For instance, if the
command file named
cmd_file
contains the lines
gd 2 data.$1 wi $2 $3 5 5and you type on the command line
do cmds 32 2 3,
the plot program
will get data from the file
data.32
and place a 5cm × 5cm window
2cm from the left and 3cm from the bottom of the page.
Up to nine arguments may be passed to the command file on the command line. The variable
$0 is replaced by the name of the command
file.
On the command line, arguments are separated by spaces, except
that double quotes may be used to group several words as a single
argument.
Literal double quotes and dollar signs may be passed as
\" and
\$.