I noticed this call coming into our support desk today. The user needed to change the scale of every symbol in the entire JIC or NFPA library. That’s quite the task to tackle manually. There are over 1,700 symbols in the NFPA folder with another 133 in the 1- subfolder. The IEC library contains over 3,300 symbols! Opening each and every symbol to simply change a scale or change an attributes text height is an extremely time consuming and monotonous task.
Make a backup of the library folder first of all. Then start the Modify Symbol Library utility. After selecting the library folder to modify, the final dialog allows all kinds of changes. Also note the ability to run a LISP expression. So pretty much anything can be done to each and every symbol in the library.