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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 |
UNGET(1P) POSIX Programmer's Manual UNGET(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.
unget — undo a previous get of an SCCS file (DEVELOPMENT)
unget [−ns] [−r SID] file...
The unget utility shall reverse the effect of a get −e done prior to
creating the intended new delta.
The unget utility shall conform to the Base Definitions volume of
POSIX.1‐2008, Section 12.2, Utility Syntax Guidelines.
The following options shall be supported:
−r SID Uniquely identify which delta is no longer intended. (This
would have been specified by get as the new delta.) The use
of this option is necessary only if two or more outstanding
get commands for editing on the same SCCS file were done by
the same person (login name).
−s Suppress the writing to standard output of the intended
delta's SID.
−n Retain the file that was obtained by get, which would
normally be removed from the current directory.
The following operands shall be supported:
file A pathname of an existing SCCS file or a directory. If file
is a directory, the unget 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 when the file
operand is specified as '−'. Each line of the text file shall be
interpreted as an SCCS pathname.
Any SCCS files processed shall be files of an unspecified format.
The following environment variables shall affect the execution of
unget:
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.
NLSPATH Determine the location of message catalogs for the
processing of LC_MESSAGES.
Default.
The standard output shall consist of a line for each file, in the
following format:
"%s\n", <SID removed from file>
If there is more than one named file or if a directory or standard
input is named, each pathname shall be written before each of the
preceding lines:
"\n%s:\n", <pathname>
The standard error shall be used only for diagnostic messages.
Any SCCS files updated shall be files of an unspecified format.
During processing of a file, a locking z-file, as described in get,
and a q-file (a working copy of the p-file), may be created and
deleted. The p-file and g-file, as described in get, shall be
deleted.
None.
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
Default.
The following sections are informative.
None.
None.
None.
None.
delta(1p), get(1p), sact(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 UNGET(1P)
Pages that refer to this page: sact(1p), sccs(1p)