Intel XENIX 286 Programmers Guide (86) - Tenox.tc

XENIX Programming SCCS: Source Code Control System
After retrieving a text file, the command displays a message giving the SID of the file
and its size in lines. The message also displays a proposed SID, that is, the SID for the
new version after editing. For example, after retrieving the six-line C program in
s.demo.c, the command displays the message
1.1
new delta 1.2
Glines
The proposed SID is 1.2. If more than one file is retrieved, the corresponding file name
precedes the relevant information.
Note that any changes made to the text file are not immediately copied to the
corresponding s-file. To save these changes you must use the delta command described
in the next section. To help keep track of the current file version, the get command
creates another file, called a p-file, that contains information about the text file. This
file is used by a subsequent delta command when saving the new version. The p-file has
the same name as the s-file but begins with "p.". The user must not access the p-file
directly.
Saving a New Version of a File
Yoti can save a new version of a text file by using the delta command. The command
has the form
delta s. filename
where s.filename is the name of the s-file from which the modified text file was
retrieved. For example, to save changes made to a C program in the file demo.c (which
was retrieved from the file s.demo.c), type
delta s.demo.c
Before saving the new version, the delta command asks for comments explaining the
nature of the changes. It displays the prompt
comments?
You may type any text you think appropriate, up to 512 characters. The comment must
end with a newline character. If necessary, you can start a new line by typing a
backslash {\) followed by a newline character. If you do not wish to include a comment,
just type a newline character.
Once you have given a comment, the command uses the information in the
corresponding p-file to compare the original version with the new version. A list of all
the changes is copied to the s-file. This is the new delta.
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