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Unix - Frequently Asked Questions (7/7) [Frequent posting]

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Archive-name: unix-faq/faq/part7
Version: $Id: part7,v 2.9 1996/06/11 13:07:56 tmatimar Exp $

See reader questions & answers on this topic! - Help others by sharing your knowledge
These seven articles contain the answers to some Frequently Asked
Questions often seen in comp.unix.questions and comp.unix.shell.
Please don't ask these questions again, they've been answered plenty
of times already - and please don't flame someone just because they may
not have read this particular posting.  Thank you.

This collection of documents is Copyright (c) 1994, Ted Timar, except
Part 6, which is Copyright (c) 1994, Pierre Lewis and Ted Timar.
All rights reserved.  Permission to distribute the collection is
hereby granted providing that distribution is electronic, no money
is involved, reasonable attempts are made to use the latest version
and all credits and this copyright notice are maintained.
Other requests for distribution will be considered.  All reasonable
requests will be granted.

All information here has been contributed with good intentions, but
none of it is guaranteed either by the contributors or myself to be
accurate.  The users of this information take all responsibility for
any damage that may occur.

Many FAQs, including this one, are available on the archive site
rtfm.mit.edu in the directory pub/usenet/news.answers.
The name under which a FAQ is archived appears in the "Archive-Name:"
line at the top of the article.  This FAQ is archived as
"unix-faq/faq/part[1-7]".

These articles are divided approximately as follows:

      1.*) General questions.
      2.*) Relatively basic questions, likely to be asked by beginners.
      3.*) Intermediate questions.
      4.*) Advanced questions, likely to be asked by people who thought
           they already knew all of the answers.
      5.*) Questions pertaining to the various shells, and the differences.
      6.*) An overview of Unix variants.
      7.*) An comparison of configuration management systems (RCS, SCCS).

This article includes answers to:

      7.1)  RCS vs SCCS:  Introduction
      7.2)  RCS vs SCCS:  How do the interfaces compare?
      7.3)  RCS vs SCCS:  What's in a Revision File?
      7.4)  RCS vs SCCS:  What are the keywords?
      7.5)  What's an RCS symbolic name?
      7.6)  RCS vs SCCS:  How do they compare for performance?
      7.7)  RCS vs SCCS:  Version Identification.
      7.8)  RCS vs SCCS:  How do they handle problems?
      7.9)  RCS vs SCCS:  How do they interact with make(1)?
      7.10) RCS vs SCCS:  Conversion
      7.11) RCS vs SCCS:  Support
      7.12) RCS vs SCCS:  Command Comparison
      7.13) RCS vs SCCS:  Acknowledgements
      7.14) Can I get more information on configuration management systems?

If you're looking for the answer to, say, question 7.5, and want to skip
everything else, you can search ahead for the regular expression "^7.5)".

While these are all legitimate questions, they seem to crop up in
comp.unix.questions or comp.unix.shell on an annual basis, usually
followed by plenty of replies (only some of which are correct) and then
a period of griping about how the same questions keep coming up.  You
may also like to read the monthly article "Answers to Frequently Asked
Questions" in the newsgroup "news.announce.newusers", which will tell
you what "UNIX" stands for.

With the variety of Unix systems in the world, it's hard to guarantee
that these answers will work everywhere.  Read your local manual pages
before trying anything suggested here.  If you have suggestions or
corrections for any of these answers, please send them to to
tmatimar@isgtec.com.


Subject: RCS vs SCCS: Introduction Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.1) RCS vs SCCS: Introduction The majority of the replies (in a recent poll) were in favor of RCS, a few for SCCS, and a few suggested alternatives such as CVS. Functionally RCS and SCCS are practically equal, with RCS having a bit more features since it continues to be updated. Note that RCS learned from the mistakes of SCCS...
Subject: RCS vs SCCS: How do the interfaces compare? Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.2) RCS vs SCCS: How do the interfaces compare? RCS has an easier interface for first time users. There are less commands, it is more intuitive and consistent, and it provides more useful arguments. Branches have to be specifically created in SCCS. In RCS, they are checked in as any other version.
Subject: RCS vs SCCS: What's in a Revision File? Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.3) RCS vs SCCS: What's in a Revision File? RCS keeps history in files with a ",v" suffix. SCCS keeps history in files with a "s." prefix. RCS looks for RCS files automatically in the current directory or in a RCS subdirectory, or you can specify an alternate RCS file. The sccs front end to SCCS always uses the SCCS directory. If you don't use the sccs front end, you must specify the full SCCS filename. RCS stores its revisions by holding a copy of the latest version and storing backward deltas. SCCS uses a "merged delta" concept. All RCS activity takes place within a single RCS file. SCCS maintains several files. This can be messy and confusing. Editing either RCS or SCCS files is a bad idea because mistakes are so easy to make and so fatal to the history of the file. Revision information is easy to edit in both types, whereas one would not want to edit the actual text of a version in RCS. If you edit an SCCS file, you will have to recalculate the checksum using the admin program.
Subject: RCS vs SCCS: What are the keywords? Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.4) RCS vs SCCS: What are the keywords? RCS and SCCS use different keywords that are expanded in the text. For SCCS the keyword "%I%" is replaced with the revision number if the file is checked out for reading. The RCS keywords are easier to remember, but keyword expansion is more easily customized in SCCS. In SCCS, keywords are expanded on a read-only get. If a version with expanded keywords is copied into a file that will be deltaed, the keywords will be lost and the version information in the file will not be updated. On the other hand, RCS retains the keywords when they are expanded so this is avoided.
Subject: What's an RCS symbolic name? Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.5) What's an RCS symbolic name? RCS allows you treat a set of files as a family of files while SCCS is meant primarily for keeping the revision history of files. RCS accomplishes that with symbolic names: you can mark all the source files associated with an application version with `rcs -n', and then easily retrieve them later as a cohesive unit. In SCCS you would have to do this by writing a script to write or read all file names and versions to or from a file.
Subject: RCS vs SCCS: How do they compare for performance? Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.6) RCS vs SCCS: How do they compare for performance? Since RCS stores the latest version in full, it is much faster in retrieving the latest version. After RCS version 5.6, it is also faster than SCCS in retrieving older versions.
Subject: RCS vs SCCS: Version Identification. Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.7) RCS vs SCCS: Version Identification. SCCS is able to determine when a specific line of code was added to a system.
Subject: RCS vs SCCS: How do they handle problems? Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.8) RCS vs SCCS: How do they handle problems? If you are missing the sccs or rcs tools, or the RCS or SCCS file is corrupt and the tools don't work on it, you can still retrieve the latest version in RCS. Not true with SCCS.
Subject: RCS vs SCCS: How do they interact with make(1)? Date: Wed, 30 Dec 1992 10:41:51 -0700 >From: Blair P. Houghton <bhoughto@sedona.intel.com> 7.9) RCS vs SCCS: How do they interact with make(1)? The fact that SCCS uses prefixes (s.file.c) means that make(1) can't treat them in an ordinary manner, and special rules (involving '~' characters) must be used in order for make(1) to work with SCCS; even so, make(1) on some UNIX platforms will not apply default rules to files that are being managed with SCCS. The suffix notation (file.c,v) for RCS means that ordinary suffix-rules can be used in all implementations of make(1), even if the implementation isn't designed to handle RCS files specially.
Subject: RCS vs SCCS: Conversion. Date: Tue, 10 Jan 1995 21:01:41 -0500 >From: Ed Ravin <elr@wp.prodigy.com> 7.10) RCS vs SCCS: Conversion. An unsupported C-Shell script is available to convert from SCCS to RCS. You can find it in ftp://ftp.std.com/src/gnu/cvs-1.3/contrib/ One would have to write their own script or program to convert from RCS to SCCS.
Subject: RCS vs SCCS: Support Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.11) RCS vs SCCS: Support SCCS is supported by AT&T. RCS is supported by the Free Software Foundation. Therefore RCS runs on many more platforms, including PCs. Most make programs recognize SCCS's "s." prefix while GNU make is one of the few that handles RCS's ",v" suffix. Some tar programs have a -F option that ignores either RCS directories, or SCCS directories or both.
Subject: RCS vs SCCS: Command Comparison Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.12) RCS vs SCCS: Command Comparison SCCS RCS Explanation ==== === =========== sccs admin -i -nfile file ci file Checks in the file for the first time, creating the revision history file. sccs get file co file Check out a file for reading. sccs edit file co -l file Check out a file for modification. sccs delta file ci file Check in a file previously locked. what file ident file Print keyword information. sccs prs file rlog file Print a history of the file. sccs sccsdiff -rx -ry file rcsdiff -rx -ry file Compare two revisions. sccs diffs file rcsdiff file Compare current with last revision. sccs edit -ix-y file rcsmerge -rx-y file Merge changes between two versions into file. ??? rcs -l file Lock the latest revision. ??? rcs -u file Unlock the latest revision. Possible to break another's lock, but mail is sent to the other user explaining why.
Subject: RCS vs SCCS: Acknowledgements Date: Sat, 10 Oct 92 19:34:39 +0200 >From: Bill Wohler <wohler@newt.com> 7.13) RCS vs SCCS: Acknowledgements I would like to thank the following persons for contributing to these articles. I'd like to add your name to the list--please send comments or more references to Bill Wohler <wohler@newt.com>. Karl Vogel <vogel@c-17igp.wpafb.af.mil> Mark Runyan <runyan@hpcuhc.cup.hp.com> Paul Eggert <eggert@twinsun.com> Greg Henderson <henders@infonode.ingr.com> Dave Goldberg <dsg@mbunix.mitre.org> Rob Kurver <rob@pact.nl> Raymond Chen <rjc@math.princeton.edu> Dwight <dwight@s1.gov>
Subject: Can I get more information on configuration management systems? Date: Thu Oct 15 10:27:47 EDT 1992 >From: Ted Timar <tmatimar@isgtec.com> 7.14) Can I get more information on configuration management systems? Bill Wohler, who compiled all of the information in this part of the FAQ, has compiled much more information. This information is available for ftp from ftp.wg.omron.co.jp (133.210.4.4) under "pub/unix-faq/docs/rev-ctl-sys". ------------------------------ End of unix/faq Digest part 7 of 7 ********************************** -- Ted Timar - tmatimar@isgtec.com ISG Technologies Inc., 6509 Airport Road, Mississauga, Ontario, Canada L4V 1S7

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