740 Part VI . Programming in Linux (Web hosting service) RCS s
740 Part VI . Programming in Linux RCS s command-line options are cumulative, as you might expect, and RCS does a good job of disallowing incompatible options. To check out and lock a specific revision of howdy.c, you would use a command like co -l -r2.1 howdy.c. Similarly, ci -u -r3 howdy.c checks in howdy.c, assigns it revision number 3.1, and deposits a read-only revision 3.1 working file back into your current working directory. The following example creates revision 2.1 of howdy.c. Make sure you have checked out and changed howdy.c somehow before executing this command. $ ci -r2 howdy.c RCS/howdy.c,v <-- howdy.c new revision: 2.1; previous revision: 1.2 enter log message, terminated with single . or end of file: >> Added something >> . done This command is equivalent to ci -r2.1 howdy.c. The next example checks out revision 1.2 of howdy.c, disregarding the presence of higher-numbered revisions in the working directory. $ co -r1.2 howdy.c RCS/howdy.c,v –> howdy.c revision 1.2 done The handy command shown next discards all of the changes you ve made and lets you start over with a known good source file. $ co -l -f howdy.c RCS/howdy.c,v –> howdy.c revision 2.1 (locked) done When used with ci, -f forces RCS to check in a file even if it has not changed. Source Code Control with CVS You may have noticed that RCS has some shortcomings that make it inadequate for use on large projects. First, without some sophisticated wrapper scripts to provide the directory handling machinery, RCS doesn t work very well with a single, centralized repository. Its repository is always the current directory unless you exert yourself to use a directory located elsewhere. More pertinent for Linux and other open source projects, RCS is utterly unsuitable for distributed development because it doesn t support network protocols. (That is, it doesn t work over the Internet.)
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