VAL(1P) POSIX Programmer's Manual VAL(1P)PROLOG
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implementation of this interface may differ (consult the corresponding
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NAMEval - validate SCCS files (DEVELOPMENT)
SYNOPSISval-
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
IEEE Std 1003.1-2001, 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 num‐
ber. 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 out‐
put 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% key‐
word 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
IEEE Std 1003.1-2001, Section 8.2, Internationalization Vari‐
ables 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 standard input is used, a line of input shall be written before each
of the preceding lines for files containing discrepancies:
"%s:\n", <input line>
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 check‐
ing "$?" 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
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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 .
IEEE/The Open Group 2003 VAL(1P)
