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Tracking versions with SCCS

Updating source

get -e indicates an intent to make a delta. First, get checks the following:

A failure of any of the first three conditions causes the processing of the corresponding SCCS file to terminate.

If the above checks succeed, get -e causes the creation of a g-file in the current directory with mode 644 (readable by everyone, writable only by the owner) that is owned by the real user. If a writable g-file already exists, get terminates with an error.

Any ID keywords appearing in the g-file are not replaced by get -e because the generated g-file is subsequently used to create another delta.

In addition, get -e causes the creation (or updating) of the p.file that is used to pass information to the delta command.

The following

   $ get -e s.abc
produces (for example) on the standard output
   1.3
   new delta 1.4
   67 lines

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