MPE/iX Shell and Utilities Reference Manual, Vol 2

rcsfile(3) MPE/iX Shell and Utilities rcsfile(3)
<name> ::= <letter>{<digit><letter>_}*
<letter> ::= A  B  ...  Z  a  b  ...  z
<idchar> ::= Any printing ASCII character except space,
tab, carriage return, new line, and <special>.
<special> ::= ;  :  ,  @
<string> ::= @{any
ASCII character, with @ doubled}∗@
Identifiers are case-sensitive. Keywords are in lowercase only. The sets of keywords and
identifiers may overlap.
Each <delta> node must have a corresponding <deltatext>, even if the <deltatext> is empty.
The <delta> nodes form a tree. All nodes with numbers that consist of a single pair (for ex-
ample, 2.3, 2.1, and 1.3) are on the "trunk", and are linked through the next field in order of
decreasing numbers. The head field in the <admin> node points to the head of that sequence
(that is, contains the highest pair). The branch node in the <admin> node indicates the default
branch (or revision) for most
RCS
operations. If empty, the default branch is the highest
branch on the trunk.
All <delta> nodes with numbers that consist of 2n fields (n≥2) (for example, 3.1.1.1 and
2.1.2.2) are linked as follows. All nodes with identical first (2n)–1 number fields are linked
through the next field in order of increasing numbers. For each such sequence, the <delta>
node with a number that is identical to the first 2(n–1) number fields of the deltas on that se-
quence is called the branchpoint. The branches field of a node contains a list of the numbers
of the first nodes of all sequences for which it is a branchpoint. This list is ordered in increas-
ing numbers.
Miscellaneous Information 3-25