The unget utility shall conform to the Base Definitions volume of
IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
The following options shall be supported:
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
Suppress the writing to standard output of the intended
Retain the file that was obtained by get, which
would normally be removed from the current directory.
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 following environment variables shall affect the execution of unget:
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.)
If set to a non-empty string value, override the values of
all the other internationalization variables.
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).
Determine the locale that should be used to affect the
format and contents of diagnostic messages written to standard error.
Determine the location of message catalogs for the
processing of LC_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.
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