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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 (con-
sult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on
Linux.

NAME
unget - undo a previous get of an SCCS file (DEVELOPMENT)

SYNOPSIS
unget [-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 IEEE Std 1003.1-2001, 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.

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 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.

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 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 international-
ization 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 stan-
dard 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 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>

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.