Linux Shell Scripting Cookbook - Third Edition

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The differences between two revisions are useful, but it's more useful to see the entire file annotated to show when lines were added.

The fossil blame command generates an annotated listing of a file showing when lines were added:

$ fossil blame main.tcl
7806f43641 2016-12-18    clif: # main.tcl
06e155a6c2 2016-12-19    clif: # Clif Flynt
b2420ef6be 2016-12-19    clif: # Packt fossil Test Script
a387090833 2016-12-19    clif:
76074da03c 2016-12-20    clif: for {set i 0} {$i < 10} {incr
i} {
76074da03c 2016-12-20    clif: puts "Buy my book"
2204206a18 2016-12-20    clif: }
7a7e2580c4 2016-12-20    clif:

When you know that there's a problem in one version but not in another, you need to center in on the version where the problem was introduced. ...