TP(I) 10/15/73 TP(I)
NAME
tp - manipulate DECtape and magtape
SYNOPSIS
tp [ key ] [ name ... ]
DESCRIPTION
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
directory. 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 extracted.
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 desired.
m Specifies magtape as opposed to DECtape.
0,...,7This 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 zeroed before beginning. Usable only
with r and u. This option is assumed with magtape
since it is impossible to selectively overwrite
magtape.
f causes new entries on tape to be `fake' in that
no data is present for these entries. Such fake
entries cannot be extracted. Usable only with r
and u.
i Errors reading and writing the tape are noted,
but no action is taken. Normally, errors cause a
return to the command level.
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.
FILES
/dev/tap?
/dev/mt?
DIAGNOSTICS
Several; the non-obvious one is `Phase error', which means
the file changed after it was selected for dumping but
before it was dumped.
BUGS
A single file with several links to it is treated like
several files.