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## 5. `ci(1)` and `co(1)`.

`ci(1)` and `co(1)` are the commands used to check files in and out of their RCS archives. The `ci(1)` command may also be used to a check a file both in and out of an archive. In their simplest forms, `ci(1)` and `co(1)` take only the name of the working file.

    ci name_of_work_file

and

    co name_of_work_file

The command form

    ci -l name_of_work_file

checks in the file with locking enabled, and

    co -l name_of_work_file

is performed automatically. That is, `ci -l` checks the file out again with locking enabled.

    ci -u name_of_work_file

checks the file into the archive, and checks it out again with locking disabled. In all cases, the user is prompted for a log message.

`ci(1)` will also create a RCS archive if one does not exist already.

If you don't specify a revision, `ci(1)` increments the version number of the last revision locked in the archive, and appends the revised working file to it. If you specify a revision on an existing branch, it must be higher than the existing revision numbers. `ci(1)` will also create a new branch if you specify the revision of a branch which does not exist. See the `ci(1)` and `co(1)` man pages for details.

`ci(1)` and `co(1)` have various options for interactive and non-interactive use. Again, see the `ci(1)` and `co(1)` man pages for details.

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