UNGET(1P) POSIX Programmer's Manual UNGET(1P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
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not be implemented on Linux.
NAMEunget — undo a previous get of an SCCS file (DEVELOPMENT)
SYNOPSISunget [−ns] [−r SID] file...
DESCRIPTION
The unget utility shall reverse the effect of a get −e done prior to
creating the intended new delta.
OPTIONS
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 nor‐
mally be removed from the current directory.
OPERANDS
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 stan‐
dard input shall be read; each line of the standard input
shall be taken to be the name of an SCCS file to be pro‐
cessed. Non-SCCS files and unreadable files shall be silently
ignored.
STDIN
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.
INPUT FILES
Any SCCS files processed shall be files of an unspecified format.
ENVIRONMENT VARIABLES
The following environment variables shall affect the execution of
unget:
LANG Provide a default value for the internationalization vari‐
ables that are unset or null. (See the Base Definitions vol‐
ume of POSIX.1‐2008, 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.
NLSPATH Determine the location of message catalogs for the processing
of LC_MESSAGES.
ASYNCHRONOUS EVENTS
Default.
STDOUT
The standard output shall consist of a line for each file, in the fol‐
lowing 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 pre‐
ceding lines:
"\n%s:\n", <pathname>
STDERR
The standard error shall be used only for diagnostic messages.
OUTPUT FILES
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.
EXTENDED DESCRIPTION
None.
EXIT STATUS
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
CONSEQUENCES OF ERRORS
Default.
The following sections are informative.
APPLICATION USAGE
None.
EXAMPLES
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
delta, get, sact
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
Variables, Section 12.2, Utility Syntax Guidelines
COPYRIGHT
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 Electri‐
cal 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.ker‐
nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 UNGET(1P)
