vc(1) vc(1)NAME vc - manipulates version control information inside a data stream SYNOPSIS vc [-a] [-cchar] [-s] [-t] [keyword=value]... ARGUMENTS -a Forces replacement of keywords surrounded by control characters with their assigned value in all text lines and not just in vc statements. 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 \. -cchar Specifies a control character to be used in place of :. keyword=value Specifies the user declared keyword that was set by .dcl and the value it was assisgned. 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. See ``Version Control Statements'' later in this manual page for details. -s Silences warning messages (not error) that are normally printed on the output. -t Ignores all characters from the beginning of a line up to and including the first tab character for the purpose of detecting a control statement. If one is found, all characters up to and including the tabs are discarded. DESCRIPTION The vc command copies lines from the standard input to the standard output under control of its arguments and 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 character, (unless the -t option is used, in which January 1992 1
vc(1) vc(1)case, all characters up to and including the first tab are ignored, and what follows begins the control statement). The default control character is colon (:). This can be changed by the -c option (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 noncontrol character are copied in their entirety. Replacement of keywords by values is done whenever a keyword surrounded by control characters is encountered on a version control statement. Version Control Statements :dcl keyword[,...,keyword] Declares keywords. All keywords must be declared. :asg keyword=value Assigns values to keywords. An asg statement overrides the assignment for the corresponding keyword on the vc command line and all previous asg's for that keyword. Keywords declared, but not assigned values have null values. :if condition . . . :end Skips 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 that 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 2 January 1992
vc(1) vc(1)!= 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 (e.g., : 012 > 12 is false). All other operators take strings as arguments (e.g., : 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 Replaces keywords on lines that are copied to the standard 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 option. :on :off Turns on or off keyword replacement on all lines. :ctl char Changes the control character to char. :msg message Prints the given message on the output. :err message Prints the given message followed by: ERROR: err statement on line ... (915) on the output. vc halts execution, and returns an exit code of 1. January 1992 3
vc(1) vc(1)EXAMPLES If you have a file named note containing: :dcl NAME,PLACE :NAME:, Just a note to remind you that we have a meeting scheduled Monday morning at :PLACE:. the command vc -a NAME=Joe PLACE=University < note will produce Joe, Just a note to remind you that we have a meeting scheduled Monday morning at the University. STATUS MESSAGES AND VALUES 0 normal 1 any error Use help for explanations. FILES /usr/bin/vc Executable file SEE ALSO admin(1), cdc(1), comb(1), delta(1), ed(1), get(1), help(1), rmdel(1), prs(1), sact(1), sccs(1), sccsdiff(1), unget(1), val(1), what(1) sccsfile(4) in A/UX Programmer's Reference ``SCCS Reference'' in A/UX Programming Languages and Tools, Volume 2 4 January 1992