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PROLOG | NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | STDIN | INPUT FILES | ENVIRONMENT VARIABLES | ASYNCHRONOUS EVENTS | STDOUT | STDERR | OUTPUT FILES | EXTENDED DESCRIPTION | EXIT STATUS | CONSEQUENCES OF ERRORS | APPLICATION USAGE | EXAMPLES | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
DELTA(1P) POSIX Programmer's Manual DELTA(1P)
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.
delta — make a delta (change) to an SCCS file (DEVELOPMENT)
delta [−nps] [−g list] [−m mrlist] [−r SID] [−y[comment]] file...
The delta utility shall be used to permanently introduce into the
named SCCS files changes that were made to the files retrieved by get
(called the g-files, or generated files).
The delta utility shall conform to the Base Definitions volume of
POSIX.1‐2008, Section 12.2, Utility Syntax Guidelines, except that
the −y option has an optional option-argument. This optional option-
argument shall not be presented as a separate argument.
The following options shall be supported:
−r SID Uniquely identify which delta is to be made to the SCCS
file. The use of this option shall be necessary only if two
or more outstanding get commands for editing (get −e) on
the same SCCS file were done by the same person (login
name). The SID value specified with the −r option can be
either the SID specified on the get command line or the SID
to be made as reported by the get utility; see get(1p).
−s Suppress the report to standard output of the activity
associated with each file. See the STDOUT section.
−n Specify retention of the edited g-file (normally removed at
completion of delta processing).
−g list Specify a list (see get(1p) for the definition of list) of
deltas that shall be ignored when the file is accessed at
the change level (SID) created by this delta.
−m mrlist Specify a modification request (MR) number that the
application shall supply as the reason for creating the new
delta. This shall be used if the SCCS file has the v flag
set; see admin(1p).
If −m is not used and '−' is not specified as a file
argument, and the standard input is a terminal, the prompt
described in the STDOUT section shall be written to
standard output before the standard input is read; if the
standard input is not a terminal, no prompt shall be
issued.
MRs in a list shall be separated by <blank> characters or
escaped <newline> characters. An unescaped <newline> shall
terminate the MR list. The escape character is <backslash>.
If the v flag has a value, it shall be taken to be the name
of a program which validates the correctness of the MR
numbers. If a non-zero exit status is returned from the MR
number validation program, the delta utility shall
terminate. (It is assumed that the MR numbers were not all
valid.)
−y[comment]
Describe the reason for making the delta. The comment shall
be an arbitrary group of lines that would meet the
definition of a text file. Implementations shall support
comments from zero to 512 bytes and may support longer
values. A null string (specified as either −y, −y"", or in
response to a prompt for a comment) shall be considered a
valid comment.
If −y is not specified and '−' is not specified as a file
argument, and the standard input is a terminal, the prompt
described in the STDOUT section shall be written to
standard output before the standard input is read; if the
standard input is not a terminal, no prompt shall be
issued. An unescaped <newline> shall terminate the comment
text. The escape character is <backslash>.
The −y option shall be required if the file operand is
specified as '−'.
−p Write (to standard output) the SCCS file differences before
and after the delta is applied in diff format; see
diff(1p).
The following operand shall be supported:
file A pathname of an existing SCCS file or a directory. If file
is a directory, the delta utility shall behave as though
each file in the directory were specified as a named file,
except that non-SCCS files (last component of the pathname
does not begin with s.) and unreadable files shall be
silently ignored.
If exactly one file operand appears, and it is '−', the
standard input shall be read; each line of the standard
input shall be taken to be the name of an SCCS file to be
processed. Non-SCCS files and unreadable files shall be
silently ignored.
The standard input shall be a text file used only in the following
cases:
* To read an mrlist or a comment (see the −m and −y options).
* A file operand shall be specified as '−'. In this case, the −y
option must be used to specify the comment, and if the SCCS file
has the v flag set, the −m option must also be used to specify
the MR list.
Input files shall be text files whose data is to be included in the
SCCS files. If the first character of any line of an input file is
<SOH> in the POSIX locale, the results are unspecified. If this file
contains more than 99999 lines, the number of lines recorded in the
header for this file shall be 99999 for this delta.
The following environment variables shall affect the execution of
delta:
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.
TZ Determine the timezone in which the time and date are
written in the SCCS file. If the TZ variable is unset or
NULL, an unspecified system default timezone is used.
If SIGINT is caught, temporary files shall be cleaned up and delta
shall exit with a non-zero exit code. The standard action shall be
taken for all other signals; see Section 1.4, Utility Description
Defaults.
The standard output shall be used only for the following messages in
the POSIX locale:
* Prompts (see the −m and −y options) in the following formats:
"MRs? "
"comments? "
The MR prompt, if written, shall always precede the comments
prompt.
* A report of each file's activities (unless the −s option is
specified) in the following format:
"%s\n%d inserted\n%d deleted\n%d unchanged\n", <New SID>,
<number of lines inserted>, <number of lines deleted>,
<number of lines unchanged>
The standard error shall be used only for diagnostic messages.
Any SCCS files updated shall be files of an unspecified format.
System Date and Time
When a delta is added to an SCCS file, the system date and time shall
be recorded for the new delta. If a get is performed using an SCCS
file with a date recorded apparently in the future, the behavior is
unspecified.
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
Default.
The following sections are informative.
Problems can arise if the system date and time have been modified
(for example, put forward and then back again, or unsynchronized
clocks across a network) and can also arise when different values of
the TZ environment variable are used.
Problems of a similar nature can also arise for the operation of the
get utility, which records the date and time in the file body.
None.
None.
None.
Section 1.4, Utility Description Defaults, admin(1p), diff(1p),
get(1p), prs(1p), rmdel(1p)
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
Variables, Section 12.2, Utility Syntax Guidelines
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 .
IEEE/The Open Group 2013 DELTA(1P)
Pages that refer to this page: admin(1p), get(1p), prs(1p), rmdel(1p), sact(1p), sccs(1p), unget(1p), val(1p)