Next: DO Loops Up: MIDAS Command Language Previous: Passing Parameters in . As mentioned before, the Monitor performs symbol substitutions on MIDAS command lines in the first pass by replacing symbol names in the command line with their current value. For character symbols just the string is put in; for symbols of other types the binary data are converted to ASCII using the formats specified in the SET/FORMAT command. ... Example 6, MIDAS procedure exa6.prg . ... WRITE/KEYWORD VAR/R/1/1 0. ! ...

... It is possible to change the meaning of keywords (to `overload' them), but it can be confusing, primarily because your new commands may not behave the same way that this manual claims. ... If you said box in your macro, then overloaded the keyword, you'd have a macro that called itself. ... Another example is that (when overloaded) lines saves the line numbers used, so that you can write a macro to print the top 10 lines of a file (it's called head ). ...

. Options modify the way that a command works. They usually consist of a hyphen followed by a single letter. For example the wc command counts the number of words, characters and lines in a file. By using a different option you can choose what is counted. wc -w file1 counts the words wc -c file1 counts the characters wc -l file1 counts the lines . Using multiple options .

... Here we will continue to look at line plots. We will go through steps, such as changing line colors and plot ranges, you can use to modify your line plots. Note: Beginner's IDL - Line Plots III will be posted after the Thanksgiving holidays. ... Below is an example on how you can change the color of your plot as well as the background. ... IDL> plot, num, line, color = 45, background = 200 . ... IDL> plot, num, line, color=45, background = 200, /nodata . ... IDL> plot, num, line, xstyle=4 . ...

... We describe a simple method to annotate shell scripts and have a preprocessor extract a set of variables, present them to the user in a GUI (using Tcl/Tk) with context sensitive help, and run the script. ... When individual applications are (tightly) integrated into the scripting language, this offers very powerful scripts, fully graphical user interfaces and a result sometimes indistinguishable from applications. ... Here is an example header from a C-shell script with which Figure 1 was made. ...