Page 235 - Make Your Own PCBs with EAGLE from Schematic Designs to Finished Boards

Starting at the top of the file, there is a # usage marker. The remainder of that line and the two
lines that follow it specify the text that will appear in the Control Panel when you browse for ULPs.
As well as plain text, this can also contain HTML; hence the <b> tag will make the first line bold.
Next, two strings are defined. The string cmd will eventually contain a whole script full of
commands. These are not actually actioned by EAGLE until the following line of code near the end of

the file is run:

In other words, the whole ULP builds up a big string of text that is then included in the Exit command

that ends the execution of the script and also invokes the command string supplied.
The string c is used as a temporary working string whose contents will be built up and then
appended to the main cmd string.

After the string declarations, there is a definition for a function (visible). This function will
make the schematic visible and display all the relevant layers. It is called just before the script exits.

This ULP is designed to work on a schematic, and the ULP includes a test to make sure that the