[bug-gawk] Iterate over folders/files, suming sizes until limit

[Roger]

Well, I read the AWK/GAWK book ~10 years ago, and now have my first official 
use for AWK!  However, it's now Summer and am significantly rusty with skills.  
Since this is the only mailing list, and the description states, "... and 
everything else", I'll post my inquiry here.

Summary: Need to list files/folders for recording to DVD/BD-R media, with a one 
line list of folders/files for passing to growisofs or mkisofs, limiting to 
media size.  (I'm really surprised nobody has something remotely completed, 
seemingly everyone rely upon the graphical front-ends! The folders contain 
multiple surveillance audio/video files.)

Steps: Iterate over the current contents of a folder using "/bin/du", at a 
specified limit (eg. 46.5GB for 50GB BD-R media, adding the folder sizes until 
accumulated size is ~46.5GB) print a one line list of folders (for passing 
manually to growisofs), then continue repeating the previous commands until no 
more folders/files.

This sounds like a simple and desired (database field sum) task for AWK, but 
likely requiring data from "du".

The initial output will likely be:

"./20170711 ./20170712 ./20170713 ./20170714",

However I need to further format to mkisofs "-graft-points" feature: 

"20170711=./20170711  20170712=./20170712 20170713=./20170713 
20170714=20170714/"

Just need a little hand holding here as my skills are extremely rusty.

I can imagine a slightly modified AWK program using "/bin/ls" for only files 
instead of "/bin/du" for just folders, or both.  I already have part of my 
problems solved, using "du -kh --max-depth=1 |sort -k 2" to find folder size 
and sort according to the year_month_dated folder names.

I could likely easily whip-up one of my excellently written Bash scripts with 
"/bin/du" outputted temporary file to the /tmp folder without bugging anybody, 
but figure it's probably best/proper to do this all in AWK/GAWK script and have 
something posted for public use.

Roger