checkout - RCS check-out utility


       checkout [options] [file-specifications]


       Checkout  is  an  extension  of  the  RCS utility co.  It uses a file's
       check-in date to set the file's modification date after check-out.


       Checkout uses the rcs utility co.  It  is  normally  invoked  from  the
       rcsget  script,  but  may  be invoked in a standalone manner.  Checkout
       differs from co primarily in its treatment to  the  delta  date:  after
       invoking  co,  checkout  sets the file's modification date to match the
       delta-date for the extracted version.

Set-UID Operation

       Like the checkin utility, checkout properly handles  set-uid  operation
       for  a  non-root  effective  user.  The archived files are owned by the
       effective user, and the checked-out files are owned by the real user.

       Note that since checkin initializes the  access  list  in  the  archive
       files, the real user must appear on the access list to lock a file.  Of
       course, if no lock is made, then the user need not  be  on  the  access


       Checkout  recognizes all of the "co" options except for the "-d" cutoff
       date.  Instead, the "-c" option is used:

       -c cutoff
           specifies the rcs cutoff date, in SCCS-format


           Punctuation in the date is permitted.  For example,

                -c 77/2/2 9:22:25
                -c 770202092225

           represent the same date.  This option is translated to the co  "-d"

       Use  the  "-x"  option  of checkout to direct it to retain the pathname
       when translating between working and archive  files,  e.g,  "path/name"
       becomes  "path/RCS/name,v".  If the "-x" option is not set, "path/name"
       becomes "./RCS/name,v", and "path/RCS/name,v" becomes "./name".


       To extract files using checkout, you must  provide  one  or  more  file
       names.   For  each name, checkout parses the leaf-name and extracts the
       specified version from the "./RCS" directory.


       Checkout is a C-language program.  It invokes co via an execlp call (so
       that  co must be in your path), and performs pre- and postprocessing of
       the archive and working file to determine the delta-date to use for the
       extracted file.  Environment variables used by checkout include:

              if defined, specifies the directory in which rcs
               archive files are found.  Normally files are found in "./RCS".

       TZ     is  the  POSIX time zone, which is overridden internally so that
              file modification dates are independent of the local time zone.


       Checkout uses the following files:

       co     the RCS check-out program


       This does not handle rcs branches properly.

       Checkout does not handle the "-j" and "-p" options of co.


       checkin, rcsput, ded, ci (1), co (1)


       Thomas E. Dickey <>