NAME

delta − make a delta (change) to an SCCS file

SYNOPSIS

/usr/sccs/delta [ −rSID ] [ −s ] [ −n ] [ −glist ] [ −m[mrlist] ] [ −y[comment] ] [ −p ] file ...

DESCRIPTION

Delta permanently introduces into the named SCCS file changes that were made to the file retrieved by get(1) (called the g-file, or generated file).

Delta makes a delta to each named SCCS file.  If a directory is named, delta behaves as though each file in the directory were specified as a named file, except that non-SCCS files (last component of the path name does not begin with s.) and unreadable files are silently ignored.  If a name of − is given, the standard input is read (see WARNINGS); each line of the standard input is taken to be the name of an SCCS file to be processed. 

Delta may issue prompts on the standard output depending upon certain options specified and flags (see admin(1)) that may be present in the SCCS file (see −m and −y options below). 

OPTIONS

Options apply independently to each named file. 

−rSID
Uniquely identifies which delta is to be made to the SCCS file.  The use of this option is necessary only if two or more outstanding get’s for editing (get −e) on the same SCCS file were done by the same person (login name).  The SID value specified with the −r option can be either the SID specified on the get command line or the SID to be made as reported by the get command (see get(1)). A diagnostic results if the specified SID is ambiguous, or, if necessary and omitted on the command line. 

−sDo not display the created delta’s SID, number of lines inserted, deleted and unchanged in the SCCS file. 

−nRetain the edited g-file which is normally removed at completion of delta processing. 

−glistSpecifies a list of deltas to be ignored when the file is accessed at the change level (SID) created by this delta.  See get(1) for the definition of list. 

−m[mrlist]
If the SCCS file has the v flag set (see admin(1)), a Modification Request (MR) number must be supplied as the reason for creating the new delta. 

If −m is not used and the standard input is a terminal, the prompt MRs? is issued on the standard output before the standard input is read; if the standard input is not a terminal, no prompt is issued.  The MRs? prompt always precedes the comments? prompt (see −y option). 

MRs in a list are separated by blanks and/or tab characters.  An unescaped new-line character terminates the MR list. 

Note that if the v flag has a value (see admin(1)), it is taken to be the name of a program (or shell procedure) which will validate the correctness of the MR numbers.  If a non-zero exit status is returned from MR number validation program, delta terminates (it is assumed that the MR numbers were not all valid). 

−y[comment]
Arbitrary text to describe the reason for making the delta. A null string is considered a valid comment. 

If −y is not specified and the standard input is a terminal, the prompt comments? is issued on the standard output before the standard input is read; if the standard input is not a terminal, no prompt is issued.  An unescaped new-line character terminates the comment text. 

−pDisplay (on the standard output) the SCCS file differences before and after the delta is applied in a diff(1) format.

FILES

All files of the form ?-file are explained in the Source Code Control System User’s Guide.  The naming convention for these files is also described there. 

g-file Existed before the execution of delta; removed after completion of delta.

p-file Existed before the execution of delta; may exist after completion of delta.

q-file Created during the execution of delta; removed after completion of delta.

x-file Created during the execution of delta; renamed to SCCS file after completion of delta.

z-file Created during the execution of delta; removed during the execution of delta.

d-file Created during the execution of delta; removed after completion of delta.

/bin/diff Program to compute differences between the “gotten” file and the g-file.

WARNINGS

Lines beginning with an SOH ASCII character (binary 001) cannot be placed in the SCCS file unless the SOH is escaped.  This character has special meaning to SCCS (see sccsfile(5)) and will cause an error.

A get of many SCCS files, followed by a delta of those files, should be avoided when the get generates a large amount of data.  Instead, multiple get/delta sequences should be used. 

If the standard input (−) is specified on the delta command line, the −m (if necessary) and −y options must also be present.  Omission of these options is an error. 

SEE ALSO

sccs(1), admin(1), get(1), help(1), prs(1), sccsfile(5). 
Source Code Control System in Programming Tools for the Sun Workstation.

DIAGNOSTICS

Use help(1) for explanations.

Sun Release 3.0β  —  Last change: 6 March 1984