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- VVVVCCCC((((1111)))) VVVVCCCC((((1111))))
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- NNNNAAAAMMMMEEEE
- vc - version control
-
- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- vvvvcccc [----aaaa] [----tttt] [----ccccchar] [----ssss] [keyword=value ... keyword=value]
-
- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- The _v_c command copies lines from the standard input to the standard
- output under control of its _a_r_g_u_m_e_n_t_s and _c_o_n_t_r_o_l _s_t_a_t_e_m_e_n_t_s encountered
- in the standard input. In the process of performing the copy operation,
- user declared _k_e_y_w_o_r_d_s may be replaced by their string _v_a_l_u_e 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 _v_c command arguments.
-
- A control statement is a single line beginning with a control character,
- except as modified by the ----tttt keyletter (see below). The default control
- character is colon (::::), except as modified by the ----cccc 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 _e_d(1);
- 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
- ----aaaa keyletter (see below) forces replacement of keywords in _a_l_l 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 \\\\.
-
- KKKKeeeeyyyylllleeeetttttttteeeerrrr AAAArrrrgggguuuummmmeeeennnnttttssss
-
- ----aaaa Forces replacement of keywords surrounded by control
- characters with their assigned value in _a_l_l text lines and
- not just in _v_c statements.
-
- ----tttt All characters from the beginning of a line up to and
- including the first _t_a_b character are ignored for the purpose
- of detecting a control statement. If one is found, all
- characters up to and including the _t_a_b are discarded.
-
- ----ccccchar Specifies a control character to be used in place of ::::.
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- PPPPaaaaggggeeee 1111
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- VVVVCCCC((((1111)))) VVVVCCCC((((1111))))
-
-
-
- ----ssss Silences warning messages (not error) that are normally
- printed on the diagnostic output.
-
- VVVVeeeerrrrssssiiiioooonnnn CCCCoooonnnnttttrrrroooollll SSSSttttaaaatttteeeemmmmeeeennnnttttssss
-
- ::::dcl keyword[, ............, keyword]
- Used to declare keywords. All keywords must be declared.
-
- ::::asg keyword=value
- Used to assign values to keywords. An aaaassssgggg statement overrides the
- assignment for the corresponding keyword on the _v_c command line and
- all previous aaaassssgggg's for that keyword. Keywords declared, but not
- assigned values have null values.
- ::::if condition
- .
- .
- .
- ::::end
- Used to skip lines of the standard input. If the condition is true
- all lines between the _i_f statement and the matching _e_n_d statement
- are copied to the standard output. If the condition is false, all
- intervening lines are discarded, including control statements. Note
- that intervening _i_f statements and matching _e_n_d statements are
- recognized solely for the purpose of maintaining the proper _i_f-_e_n_d
- 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 _i_f, 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
- &
- |
-
-
- PPPPaaaaggggeeee 2222
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- VVVVCCCC((((1111)))) VVVVCCCC((((1111))))
-
-
-
- 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
- Used for keyword replacement 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 ----aaaa keyletter.
-
- ::::on
-
- ::::off
- Turn on or off keyword replacement on all lines.
-
- ::::ctl char
- Change the control character to char.
-
- ::::msg message
- Prints the given message on the diagnostic output.
-
- ::::err message
- Prints the given message followed by::::
- EEEERRRRRRRROOOORRRR:::: err statement on line ............ (915)
- on the diagnostic output. _v_c halts execution, and returns an exit
- code of 1.
-
- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- ed(1), help(1)
-
- DDDDIIIIAAAAGGGGNNNNOOOOSSSSTTTTIIIICCCCSSSS
- Use _h_e_l_p(1) for explanations.
-
- EEEEXXXXIIIITTTT CCCCOOOODDDDEEEESSSS
- 0 - normal
- 1 - any error
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- PPPPaaaaggggeeee 3333
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