Richard Nichols' Using Disktasks tip is good. But if you have a large system, the run collect disk space information job can run for hours! The library and file sizes are only good for the day the information was collected. If you want to know library and file size in a jiffy my tip is to do:
DSPLIB LIB(*****) OUTPUT(*PRINT)
Here is what your spool file looks like:
Display Spooled File
Display Library
Library . . . . . . . . . . . . . : *****
Type . . . . . . . . . . . . . . : PROD
Number of objects . . . . . . . . : 3
ASP . . . . . . . . . . . . . . . : 1
Create authority . . . . . . . . : *SYSVAL
Text description . . . . . . . . : *************
Object Type Attribute Size Description
*** *FILE PF 2945024
*** *FILE PF 11681792
*** *FILE PF 83824640
Total size : 98648064
* * * * * E N D O F L I S T I N G * * * * *
Hope this tip makes someone's life easier.
This was first published in March 2001