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.1‐2008,  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.

       −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 the
                 Base  Definitions  volume  of POSIX.1‐2008, 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, delta, get, prs

       The  Base  Definitions  volume  of  POSIX.1‐2008, 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, 2013 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers,  Inc
       and  The  Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/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 .