putdelta − SCCS check-in utility


putdelta [options] [file-specifications]


Putdelta is a simple, easy to use interface to sccs (source code control system). It checks into the sccs archive all files specified.


Putdelta uses the sccs utilities admin and delta to maintain versions of a given source file in a dependent directory named "SCCS" It is more than an integration of the admin and delta utilities, however:

If the sccs archive directory does not already exist, putdelta creates it.

If the file has not been locked, putdelta creates a lock (i.e., a "p." file). If a "p." file already exists, putdelta will attempt to use the lock However, if the lock belongs to another user, putdelta will not check-in the file.

Putdelta retains the executable-mode of the file which is checked-in That is, if it is a shell-script (and has a mode such as 755), the mode of sccs "s." file is set to 555 The getdelta utility works in the opposite fashion, setting the extracted file’s mode to correspond to that of the "s." file.

Putdelta sets the "-n" option of delta, so that your file is not deleted after check-in.

The "s." file is post-processed by putdelta so that the check-in date matches the file’s modification date.

The last point is the fundamental advantage offered by putdelta. The ordinary sccs methodology uses the current date as the check-in date This works well only for large projects in which a central project administrator is responsible for controlling the versions of source files It does not work well for small projects, for which sccs’s primary advantage is its compact storage of multiple versions of a file.

By using the file’s modification date as a reference, you can more easily back up to a meaningful version − by date, rather than version number.

Putdelta integrates the essential functions used in the sccs check-in process into one utility program.


The options which you may specify to putdelta are passed through to the underlying admin and delta utilities:


suppresses some of the messages generated by the sccs admin and delta utilities describing the number of lines changed, etc.


specifies the change-history text. You will be prompted for this if you do not supply it, in versions after the first, by the delta utility.


Putdelta is designed to operate with the standard sccs utilities with a minimum of fuss and bother It retains your working file after check-in since that facilitates development In effect, it simply appends the current version of each file which you specify onto the archive.


Environment variables imported by putdelta include:

specifies the directory into which the sccs "s." files are stored If no specified, putdelta assumes "SCCS".


is the prevailing timezone, which putdelta uses to set the check-in date in the "s." file Putdelta sets the timezone to EST5EDT, in part to avoid conflict with get’s date checking.


Putdelta is a single binary file, written in C It runs in a POSIX environment.


Provide a mechanism for inserting dummy version numbers so that putdelta can bump the release number (for genuine major releases) Currently, the SID’s are restricted to 1.1, 1.2, 1.3, etc.


sccsput, sccsget, getdelta, admin (1), delta (1)


Thomas Dickey (Software Productivity Consortium).