Manual Pages for UNIX Operating System command usage for man vc

User Commands                                               vc(1)



NAME
     vc - version control

SYNOPSIS
     vc [-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     This command is obsolete and will be  removed  in  the  next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 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 \.




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User Commands                                               vc(1)



OPTIONS
     The following options are supported:

     -a        Forces replacement of keywords surrounded by  con-
               trol  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 control statement is found, all characters up
               to and including the tab are discarded.


     -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  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 match-
         ing end statement are copied to the standard output.  If
         the  condition  is false, all intervening lines are dis-
         carded, including control statements. Note:  Intervening
         if statements and matching end statements are recognized
         solely for the purpose of maintaining the proper  if-end
         matching.



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User Commands                                               vc(1)



         The syntax of a condition is:

              ::=  [ ``not'' ] 


                ::=   |  ``|'' 


               ::=   |  ``&'' 


               ::=  ``(''  ``)'' |   


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


             ::=     |  

         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 condi-
                tion

         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)



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User Commands                                               vc(1)



         is:

         = != > <    all of equal precedence


         &


         |

         Parentheses may be used  to  alter  the  order  of  pre-
         cedence.

         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  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.


     :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.




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User Commands                                               vc(1)



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



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | developer/build/make        |
    |_____________________________|_____________________________|


SEE ALSO
     ed(1), attributes(5)








































SunOS 5.11           Last change: 5 Jul 1990                    5