Feb 18, 1977 — The First Version Control System Was Released
February 18, 1977
On February 18, 1977, the first widely distributed version of SCCS (Source Code Control System) was published as part of Version 7 Unix at Bell Labs.
This was one of the first practical tools that allowed developers to track changes in source code files.
Today, version control is everywhere. In 1977, it was a new idea.
What Was SCCS?
SCCS stands for Source Code Control System. It was created at Bell Labs by Marc J. Rochkind.
Before tools like SCCS, developers kept multiple copies of files by hand:
file.c
file_new.c
file_final.c
file_final2.c
It was easy to lose track of changes.
SCCS introduced a structured way to:
Store revision history inside a special file format
Record who changed what and when
Add comments to each change
Reconstruct any previous version of a file
This was revolutionary for team development.
How It Worked
SCCS stored history in text-based “s-files”.
Instead of saving full copies of every version, it stored deltas — the differences between revisions. That made it efficient even on machines with very limited disk space.
You could:
Check out a file
Modify it
Check it back in with a message
This sounds normal today. In 1977, it was advanced engineering.
The People Behind It
SCCS was developed at Bell Laboratories, the same research center where Unix itself was created.
Key figures of that era included:
Ken Thompson — co-creator of Unix
Dennis Ritchie — creator of C
Marc J. Rochkind — author of SCCS
SCCS became part of the Unix ecosystem and influenced many future systems.
Why It Matters
SCCS directly influenced later tools:
RCS (Revision Control System)
CVS (Concurrent Versions System)
Subversion
Git
Modern distributed version control systems are far more powerful, but the core idea — structured, incremental history — began here.
February 18, 1977 marks the moment version control became a standard engineering practice rather than a personal habit.
From that point forward, software development could scale.
And today, every git commit carries a small echo of SCCS.