vc - version control


     vc   [-a]   [-t]   [-c char]   [-s]    [    keyword=value...


     This command is obsolete and will be  removed  in  the  next

     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 state-
     ments) of keyword values specified in control statements  or
     as vc command arguments.

     A control statement is a single line beginning with  a  con-
     trol  character, 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 charac-
     ter  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
     surrounded 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 uninter-
     preted control character may  be  included  in  a  value  by
     preceding  it with \. If a literal \ is desired, then it too
     must be preceded by \.


     The following options are supported:

     -a    Forces replacement of keywords surrounded  by  control
           characters 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
           including  the first tab character are ignored for the
           purpose of detecting a control statement.  If  a  con-
           trol  statement  is  found,  all  characters up to and
           including the tab are discarded.

           Specifies a control character to be used in  place  of
           the ``:'' default.

     -s    Silences warning messages (not error)  that  are  nor-
           mally 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 assignment 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 out-
           put.  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:

                 ::=  [ ``not'' ] <or>

           <or>  ::=  <and> | <and> ``|'' <or>

           <and> ::=  <exp> | <exp> ``&'' <and>

           <exp> ::=  ``('' <or> ``)'' | <value> <op> <value>

           <op>  ::=  ``='' | ``!='' | ``<'' | ``>''

                 ::=  <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.

           Replace keywords on lines that are copied to the stan-
           dard  output.  The  two leading control characters are
           removed, and keywords surrounded by control characters
           in text are replaced by their value before the line is
           copied to the output file. This action is  independent
           of the -a keyletter.


     :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.


     See attributes(5) for descriptions of the  following  attri-

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWsprot                   |


     ed(1), attributes(5)

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