You can use rwloadsim as in interpreter using
#!/usr/bin/env rwloadsim
as the first lines of a script file that is given execute permission. As an example, if you create a file called echo.rwl with the following contents, put it in your PATH, and give it execute permission:
#!/usr/bin/env rwloadsim
# This is an implementation of the "echo" command
# using rwloadsim with an optional --commaseparate
$longoption:file-count=1 # Tell there is just this input rwl file
$longoption:quiet # Do not show the banner
integer commaseparate := 0;
$userswitch:commaseparate:"--commaseparate : Separate using comma"
while $# execute
if $# = 1 then
printline $1;
else
print $1 commaseparate ? "," : " ";
end if;
shift;
end while;
you have effectively implemented the echo command using rwloadsim, and it can used like this:
$ echo.rwl --commaseparate hello world
hello,world
Note that inclusion of the directives $longoption:file-count=1 and $longoption:quiet in echo.rwl imply both –quiet to not display the banner and –file-count=1 to make rwloadsim use all subsequent arguments as positional arguments made available as $1, etc. You can also ask for help text:
$ echo.rwl -H
RWP*Load Simulator user options from /path/to/bin/echo.rwl:
--commaseparate:
Separate using comma
Note that the script file must be named with the .rwl suffix for the $longoption directive to be effective.