Originální popis anglicky:
val - validate SCCS files (
DEVELOPMENT)
Návod, kniha: POSIX Programmer's Manual
val -
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, 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 .
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, 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 .
Default.
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:
Not used.
None.
None.
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.
Default.
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
s.z
EOF
-y source s.x
s.x: %Y%, -y mismatch
s.z
s.z: corrupted SCCS file
None.
None.
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 original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
