tp - manipulate tape archive
tp [ key ] [ name ... ]
Tp saves and restores files on DECtape or magtape. Its actions are controlled by the key
argument. The key is a string of characters containing at most one function letter and
possibly one or more function modifiers. Other arguments to the command are file or
directory names specifying which files are to be dumped, restored, or listed. In all
cases, appearance of a directory name refers to the files and (recursively) subdirectories
of that directory.
The function portion of the key is specified by one of the following letters:
r The named files are written on the tape. If files with the same names already
exist, they are replaced. `Same' is determined by string comparison, so `./abc'
can never be the same as `/usr/dmr/abc' even if `/usr/dmr' is the current direc-
tory. If no file argument is given, `.' is the default.
u updates the tape. u is like r, but a file is replaced only if its modification
date is later than the date stored on the tape; that is to say, if it has changed
since it was dumped. u is the default command if none is given.
d deletes the named files from the tape. At least one name argument must be given.
This function is not permitted on magtapes.
x extracts the named files from the tape to the file system. The owner and mode are
restored. If no file argument is given, the entire contents of the tape are
t lists the names of the specified files. If no file argument is given, the entire
contents of the tape is listed.
The following characters may be used in addition to the letter which selects the function
m Specifies magtape as opposed to DECtape.
0,...,7 This modifier selects the drive on which the tape is mounted. For DECtape, x is
default; for magtape `0' is the default.
v Normally tp does its work silently. The v (verbose) option causes it to type
the name of each file it treats preceded by the function letter. With the t
function, v gives more information about the tape entries than just the name.
c means a fresh dump is being created; the tape directory is cleared before begin-
ning. Usable only with r and u. This option is assumed with magtape since it
is impossible to selectively overwrite magtape.
i Errors reading and writing the tape are noted, but no action is taken. Nor-
mally, errors cause a return to the command level.
f Use the first named file, rather than a tape, as the archive. This option is
known to work only with x.
w causes tp to pause before treating each file, type the indicative letter and the
file name (as with v) and await the user's response. Response y means `yes', so
the file is treated. Null response means `no', and the file does not take part
in whatever is being done. Response x means `exit'; the tp command terminates
immediately. In the x function, files previously asked about have been
extracted already. With r, u, and d no change has been made to the tape.
Several; the non-obvious one is `Phase error', which means the file changed after it was
selected for dumping but before it was dumped.
A single file with several links to it is treated like several files.
Binary-coded control information makes magnetic tapes written by tp difficult to carry to
other machines; tar(1) avoids the problem.