The Open Group Base Specifications Issue 7
IEEE Std 1003.1, 2013 Edition
Copyright © 2001-2013 The IEEE and The Open Group

#### NAME

> val - validate SCCS files (DEVELOPMENT)

#### SYNOPSIS

> ``[XSI] val -
> val` [`-s`] [`-m` name] [`-r` SID] [`-y` type] file`...``
> `
> `

#### DESCRIPTION

> The val utility shall determine whether the specified file is an SCCS file meeting the characteristics specified by the options.

#### OPTIONS

> The val utility shall conform to XBD Utility Syntax Guidelines , except that the usage of the `'-'` operand is not strictly as intended by the guidelines (that is, reading options and operands from standard input).

> The following options shall be supported:

> -m name
>   Specify a name, which is compared with the SCCS %M% keyword in file; see get.
> -r SID
>   Specify a SID (SCCS Identification String), an SCCS delta number. A check shall be made to determine whether the SID is ambiguous (for example, -r 1 is ambiguous because it physically does not exist but implies 1.1, 1.2, and so on, which may exist) or invalid (for example, -r 1.0 or -r 1.1.0 are invalid because neither case can exist as a valid delta number). If the SID is valid and not ambiguous, a check shall be made to determine whether it actually exists.
> -s
>   Silence the diagnostic message normally written to standard output for any error that is detected while processing each named file on a given command line.
> -y type
>   Specify a type, which shall be compared with the SCCS %Y% keyword in file; see get.

#### OPERANDS

> The following operands shall be supported:

> file
>   A pathname of an existing SCCS file. If exactly one file operand appears, and it is `'-'`, the standard input shall be read: each line shall be independently processed as if it were a command line argument list. (However, the line is not subjected to any of the shell word expansions, such as parameter expansion or quote removal.)

#### STDIN

> The standard input shall be a text file used only when the file operand is specified as `'-'`.

#### INPUT FILES

> Any SCCS files processed shall be files of an unspecified format.

#### ENVIRONMENT VARIABLES

> The following environment variables shall affect the execution of val:

> LANG
>   Provide a default value for the internationalization variables that are unset or null. (See XBD Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.)
> LC_ALL
>   If set to a non-empty string value, override the values of all the other internationalization variables.
> LC_CTYPE
>   Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments and input files).
> LC_MESSAGES
>   Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error, and informative messages written to standard output.
> NLSPATH
>   Determine the location of message catalogs for the processing of LC_MESSAGES.

#### ASYNCHRONOUS EVENTS

> Default.

#### STDOUT

> The standard output shall consist of informative messages about either:

> 1. Each file processed

> 2. Each command line read from standard input

> If the standard input is not used, for each file operand yielding a discrepancy, the output line shall have the following format:

>     "%s: %s\n", <pathname>, <unspecified string>

> If the standard input is used, for each input line yielding a discrepancy, the output shall have the following format:

>     "%s\n\n %s: %s\n", <input>, <pathname>, <unspecified string>

> where <input> is the input line minus its terminating <newline>.

#### STDERR

> Not used.

#### OUTPUT FILES

> None.

#### EXTENDED DESCRIPTION

> None.

#### EXIT STATUS

> The 8-bit code returned by val shall be a disjunction of the possible errors; that is, it can be interpreted as a bit string where set bits are interpreted as follows:

> 0x80 | = | Missing file argument.
> 0x40 | = | Unknown or duplicate option.
> 0x20 | = | Corrupted SCCS file.
> 0x10 | = | Cannot open file or file not SCCS.
> 0x08 | = | SID is invalid or ambiguous.
> 0x04 | = | SID does not exist.
> 0x02 | = | %Y%, -y mismatch.
> 0x01 | = | %M%, -m mismatch.

> Note that val can process two or more files on a given command line and can process multiple command lines (when reading the standard input). In these cases an aggregate code shall be returned: a logical OR of the codes generated for each command line and file processed.

#### CONSEQUENCES OF ERRORS

> Default.

The following sections are informative.

#### APPLICATION USAGE

> Since the val exit status sets the 0x80 bit, shell applications checking `"$?"` cannot tell if it terminated due to a missing file argument or receipt of a signal.

#### EXAMPLES

> In a directory with three SCCS files- s.x (of t type "text"), s.y, and s.z (a corrupted file)-the following command could produce the output shown:

>     val - <<EOF
>     -y source s.x
>     -m y s.y
>     s.z
>     EOF
>     -y source s.x

>         s.x: %Y%, -y mismatch
>     s.z

>         s.z: corrupted SCCS file

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> admin, delta, get, prs

> XBD Environment Variables, Utility Syntax Guidelines

#### CHANGE HISTORY

> First released in Issue 2.

#### Issue 6

> The Open Group Corrigendum U025/4 is applied, correcting a typographical error in the EXIT STATUS.

#### Issue 7

> SD5-XCU-ERN-97 is applied, updating the SYNOPSIS.

> POSIX.1-2008, Technical Corrigendum 1, XCU/TC1-2008/0147 [416] and XCU/TC1-2008/0148 [416] are applied.

End of informative text.

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