VAL(P) POSIX Programmer's Manual VAL(P)
val - validate SCCS files (DEVELOPMENT)
val [-s][-m name][-r SID][-y type] file...
The val utility shall determine whether the specified file is an SCCS file meeting the
characteristics specified by the options.
The val utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, Sec-
tion 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 stan-
The following options shall be supported:
Specify a name, which is compared with the SCCS %M% keyword in file; see get .
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.
Specify a type, which shall be compared with the SCCS %Y% keyword in file; see get
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.)
The standard input shall be a text file used only when the file operand is specified as
Any SCCS files processed shall be files of an unspecified format.
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, Inter-
nationalization 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 interna-
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 argu-
ments and input files).
Determine the locale that should be used to affect the format and contents of diag-
nostic messages written to standard error, and informative messages written to
Determine the location of message catalogs for the processing of LC_MESSAGES .
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 out-
put 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>
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 multi-
ple 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 pro-
CONSEQUENCES OF ERRORS
The following sections are informative.
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.
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
-y source s.x
s.x: %Y%, -y mismatch
s.z: corrupted SCCS file
admin , delta , get , prs
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 VAL(P)