val(1p) — Linux manual page

VAL(1P)                 POSIX Programmer's Manual                VAL(1P)

PROLOG

       This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

NAME

       val — validate SCCS files (DEVELOPMENT)

SYNOPSIS

       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 the Base Definitions volume of
       POSIX.1‐2017, Section 12.2, 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(1p).

       -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(1p).

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 the Base
                 Definitions volume of POSIX.1‐2017, Section 8.2,
                 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(1p), delta(1p), get(1p), prs(1p)

       The Base Definitions volume of POSIX.1‐2017, Chapter 8,
       Environment Variables, Section 12.2, Utility Syntax Guidelines

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  In the event of any
       discrepancy between this version and the original IEEE and The
       Open Group Standard, the original IEEE and The Open Group
       Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page
       are most likely to have been introduced during the conversion of
       the source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                           VAL(1P)

Pages that refer to this page: sccs(1p)

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