ostree-cat - Display or concatenate contents of files

       This command functions much like the typical Unix "cat" command, in that it displays the contents of a
       file, or concatenates them given two or more files. However, this command requires the user to specify a
       commit - a checksum or refspec corresponding to a given build. If you use a refspec, OSTree will refer to
       the most recent commit, unless you specify a parent build using the carat (^) at the end of the refspec.
       It will then operate the command in that given commit.

$ostreecatmy-branchhelloworld.txt

                   Hello, world!

OSTree                                                                                             OSTREECAT(1)

       ostree-cat - Display or concatenate contents of files

ostreecat {COMMIT} {PATH...}