vc(1) User Commands vc(1)NAMEvc - version control
SYNOPSISvc [-a] [-t] [-c char] [-s]
[keyword=value... keyword=value]
DESCRIPTION
This command is obsolete and will be removed in the next release.
The vc command copies lines from the standard input to the standard
output under control of its arguments and of ``control statements''
encountered in the standard input. In the process of performing the
copy operation, user-declared keywords may be replaced by their string
value when they appear in plain text and/or control statements.
The copying of lines from the standard input to the standard output is
conditional, based on tests (in control statements) of keyword values
specified in control statements or as vc command arguments.
A control statement is a single line beginning with a control charac‐
ter, except as modified by the -t keyletter (see below). The default
control character is colon (:), except as modified by the -c keyletter
(see below). Input lines beginning with a backslash (\) followed by a
control character are not control lines and are copied to the standard
output with the backslash removed. Lines beginning with a backslash
followed by a non-control character are copied in their entirety.
A keyword is composed of 9 or less alphanumerics; the first must be
alphabetic. A value is any ASCII string that can be created with ed; a
numeric value is an unsigned string of digits. Keyword values may not
contain blanks or tabs.
Replacement of keywords by values is done whenever a keyword sur‐
rounded by control characters is encountered on a version control
statement. The -a keyletter (see below) forces replacement of keywords
in all lines of text. An uninterpreted control character may be
included in a value by preceding it with \. If a literal \ is desired,
then it too must be preceded by \.
OPTIONS
The following options are supported:
-a Forces replacement of keywords surrounded by control charac‐
ters with their assigned value in all text lines and not just
in vc statements.
-t All characters from the beginning of a line up to and includ‐
ing the first tab character are ignored for the purpose of
detecting a control statement. If a control statement is
found, all characters up to and including the tab are dis‐
carded.
-cchar Specifies a control character to be used in place of the
``:'' default.
-s Silences warning messages (not error) that are normally
printed on the diagnostic output.
vc recognizes the following version control statements:
:dcl keyword[, ..., keyword]
Declare keywords. All keywords must be declared.
:asg keyword=value
Assign values to keywords. An asg statement overrides the assign‐
ment for the corresponding keyword on the vc command line and all
previous asg statements for that keyword. Keywords that are
declared but are not assigned values have null values.
:if condition
...
:end
Skip lines of the standard input. If the condition is true, all
lines between the if statement and the matching end statement are
copied to the standard output. If the condition is false, all
intervening lines are discarded, including control statements.
Note: Intervening if statements and matching end statements are
recognized solely for the purpose of maintaining the proper if-end
matching.
The syntax of a condition is:
<cond> ::= [ ``not'' ] <or>
<or> ::= <and> | <and> ``|'' <or>
<and> ::= <exp> | <exp> ``&'' <and>
<exp> ::= ``('' <or> ``)'' | <value> <op> <value>
<op> ::= ``='' | ``!='' | ``<'' | ``>''
<value> ::= <arbitrary ASCII string> | <numeric string>
The available operators and their meanings are:
= equal
!= not equal
& and
| or
> greater than
< less than
() used for logical groupings
not may only occur immediately after the if, and when present,
inverts the value of the entire condition
The > and < operate only on unsigned integer values (for example, :
012 > 12 is false). All other operators take strings as arguments
(for example, : 012 != 12 is true).
The precedence of the operators (from highest to lowest) is:
= != > < all of equal precedence
&
|
Parentheses may be used to alter the order of precedence.
Values must be separated from operators or parentheses by at least
one blank or tab.
::text
Replace keywords on lines that are copied to the standard output.
The two leading control characters are removed, and keywords sur‐
rounded by control characters in text are replaced by their value
before the line is copied to the output file. This action is inde‐
pendent of the -a keyletter.
:on
:off
Turn on or off keyword replacement on all lines.
:ctl char
Change the control character to char.
:msg message
Print message on the diagnostic output.
:err message
Print message followed by:
ERROR: err statement on line ... (915)
on the diagnostic output. vc halts execution, and returns an exit
code of 1.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │developer/build/make │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOed(1), attributes(5)SunOS 5.11 5 Jul 1990 vc(1)
