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DELTA(1P)                  POSIX Programmer's Manual                 DELTA(1P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       delta - make a delta (change) to an SCCS file (DEVELOPMENT)

       delta [-nps][-g list][-m mrlist][-r SID][-y[comment]] file...

       The delta utility shall be used to permanently introduce into the named
       SCCS files changes that were made to the files retrieved by get (called
       the g-files, or generated files).

       The delta utility shall conform  to  the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001,  Section  12.2, Utility Syntax Guidelines, except
       that the -y option  has  an  optional  option-argument.  This  optional
       option-argument shall not be presented as a separate argument.

       The following options shall be supported:

       -r  SID
              Uniquely  identify  which  delta is to be made to the SCCS file.
              The use of this option shall be necessary only if  two  or  more
              outstanding  get commands 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 utility; see get .

       -s     Suppress  the  report to standard output of the activity associ-
              ated with each file. See the STDOUT section.

       -n     Specify retention of the edited g-file (normally removed at com-
              pletion of delta processing).

       -g  list
              Specify  a  list  (see get for the definition of list) of deltas
              that shall be ignored when the file is accessed  at  the  change
              level (SID) created by this delta.

       -m  mrlist
              Specify  a modification request (MR) number that the application
              shall supply as the reason for  creating  the  new  delta.  This
              shall be used if the SCCS file has the v flag set; see admin .

       If  -m is not used and '-' is not specified as a file argument, and the
       standard input is a terminal, the prompt described in the  STDOUT  sec-
       tion  shall  be written to standard output before the standard input is
       read; if the standard input is not  a  terminal,  no  prompt  shall  be

       MRs in a list shall be separated by <blank>s or escaped <newline>s.  An
       unescaped <newline> shall terminate the MR list. The  escape  character
       is <backslash>.

       If  the  v flag has a value, it shall be taken to be the name of a pro-
       gram which validates the correctness of the MR numbers. If  a  non-zero
       exit  status  is  returned  from  the MR number validation program, the
       delta utility shall terminate. (It is assumed that the MR numbers  were
       not all valid.)

              Describe  the  reason for making the delta. The comment shall be
              an arbitrary group of lines that would meet the definition of  a
              text  file.  Implementations shall support comments from zero to
              512 bytes and may support longer values. A null  string  (speci-
              fied  as either -y, -y "", or in response to a prompt for a com-
              ment) shall be considered a valid comment.

       If -y is not specified and '-' is not specified as a file argument, and
       the  standard  input  is a terminal, the prompt described in the STDOUT
       section shall be written to standard output before the  standard  input
       is  read;  if  the standard input is not a terminal, no prompt shall be
       issued. An unescaped <newline> shall terminate the  comment  text.  The
       escape character is <backslash>.

       The -y option shall be required if the file operand is specified as '-'

       -p     Write (to standard output) the SCCS file differences before  and
              after the delta is applied in diff format; see diff .

       The following operand shall be supported:

       file   A pathname of an existing SCCS file or a directory. If file is a
              directory, the delta 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 standard input shall be a text file  used  only  in  the  following

        * To read an mrlist or a comment (see the -m and -y options).

        * A  file  operand  shall  be  specified as '-' . In this case, the -y
          option must be used to specify the comment, and if the SCCS file has
          the  v  flag  set, the -m option must also be used to specify the MR

       Input files shall be text files whose data is to  be  included  in  the
       SCCS  files.  If  the  first  character of any line of an input file is
       <SOH> in the POSIX locale, the results are unspecified.  If  this  file
       contains  more  than  99999  lines, the number of lines recorded in the
       header for this file shall be 99999 for this delta.

       The following environment  variables  shall  affect  the  execution  of

       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 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.

              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,
              and informative messages written to standard output.

              Determine the location of message catalogs for the processing of
              LC_MESSAGES .

       TZ     Determine the timezone in which the time and date are written in
              the  SCCS file. If the TZ variable is unset or NULL, an unspeci-
              fied system default timezone is used.

       If SIGINT is caught, temporary files shall  be  cleaned  up  and  delta
       shall  exit  with  a  non-zero  exit code. The standard action shall be
       taken for all other signals; see Utility Description Defaults .

       The standard output shall be used only for the  following  messages  in
       the POSIX locale:

        * Prompts (see the -m and -y options) in the following formats:

          "MRs? "

          "comments? "

       The MR prompt, if written, shall always precede the comments prompt.

        * A  report  of each file's activities (unless the -s option is speci-
          fied) in the following format:

          "%s\n%d inserted\n%d deleted\n%d unchanged\n", <New SID>,
              <number of lines inserted>, <number of lines deleted>,
              <number of lines unchanged>

       The standard error shall be used only for diagnostic messages.

       Any SCCS files updated shall be files of an unspecified format.

   System Date and Time
       When a delta is added to an SCCS file, the system date and  time  shall
       be recorded for the new delta. If a get is performed using an SCCS file
       with a date recorded apparently in the future, the behavior is unspeci-

       The following exit values shall be returned:

        0     Successful completion.

       >0     An error occurred.


       The following sections are informative.

       Problems  can arise if the system date and time have been modified (for
       example, put forward and then  back  again,  or  unsynchronized  clocks
       across  a  network)  and can also arise when different values of the TZ
       environment variable are used.

       Problems of a similar nature can also arise for the  operation  of  the
       get utility, which records the date and time in the file body.




       Utility Description Defaults, admin, diff, get, prs, rmdel

       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 .

IEEE/The Open Group                  2003                            DELTA(1P)

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