This is the command ungetposix that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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 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.
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 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.
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.
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