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@amoroso
1 of 4/ Cable Repair Adminstrative System(CRAS) was Bell Labs software built late 1970s for telcos:
https://onlinelibrary.wiley.com/doi/abs/10.1002/j.1538-7305.1982.tb04342.x (sorry paywall),
From that paper:
Lines of code
16K PL/I (part on IBM mainframe, rest on UNIX)
10K C
15K Shell (mostly awk, for data transforms & reports)
6K Misc
33K documentation
This was done to move fast, adapt to real needs in the field(1st Field Trial Boston, 2nd in Southwest Bell, who told us on 1st meeting they did things different than Yankees.)