Working with the Unix OS

Development Tools
1.1
5 lines
Retrieves text in file "g.lang"
$ get -e s.lang 1.1
new delta 1.2
5 lines
Creates "lang" for both reading and writing, also creates another file p.lang" needed by "delta". Add two
more languages to the file "lang“.
SNOBOL
ADA
Recording changes via "delta"
$ delta s.lang
comments ?
added more languages
1.2
2 inserted
0 deleted
5 unchanged
Additional info about “get”
$ get -e r2 s.lang If release 2 does not exist retrieves 1.2 and names it 2.1 1.2
new delta 2.1
7 lines
Delete COBOL from languages
$ delta s.lang
comments?
deleted cobol from list
2.1
0 inserted
1 deleted
6 unchanged
The help command
$ get lang
ERROR [lang]: not an SCCS file (col)
$ help col
col:
"not an SCCS file”
A file that you think is an SCCS file does not begin with the character "s"
Delta Numbering
Think of deltas as nodes of a tree in which the root node is the original version of the file. The root is
named 1.1 and delta nodes are named 1.2, 1.3, etc. release.level.branch.sequence
Debugging
It usually faster and more efficient to place a few well placed print statements within your code and recompile it,
than resort to using adb/sdb. However newer debugging tools are mouse driven and extremely ease to use.
ADB – absolute debugger
General purpose debugger – sensitive to architecture of processor. Unless you are c assembly hacker this is a time
consuming experience.
adb [options] [objfile [corefile]]
adb a.out core
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