|
DataMuseum.dkPresents historical artifacts from the history of: ICL Comet 32 |
This is an automatic "excavation" of a thematic subset of
See our Wiki for more about ICL Comet 32 Excavated with: AutoArchaeologist - Free & Open Source Software. |
top - metrics - download
Length: 7040 (0x1b80)
Types: TextFile
Notes: UNIX file
Names: »tar.1«
└─⟦26887b7e0⟧ Bits:30009717 Comet 32 harddisk image
└─⟦28c352965⟧ »/a« UNIX Filesystem
└─⟦this⟧ »usr/man/cat1/tar.1«
1
TAR(1) UNIX Programmer's Manual TAR(1)
NAME
tar - tape archiver
SYNOPSIS
tar [ key ] [ name ... ]
DESCRIPTION
_▶08◀T_▶08◀a_▶08◀r saves and restores files on magtape. Its actions are
controlled by the _▶08◀k_▶08◀e_▶08◀y argument. The _▶08◀k_▶08◀e_▶08◀y is a string of
characters containing at most one function letter and pos-
sibly one or more function modifiers. Other arguments to
the command are file or directory names specifying which
files are to be dumped or restored. In all cases, appear-
ance of a directory name refers to the files and (recur-
sively) 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 end of the
tape. The c function implies this.
x The named files are extracted from the tape. If
the named file matches a directory whose contents
had been written onto the tape, this directory is
(recursively) extracted. The owner, modification
time, and mode are restored (if possible). If no
file argument is given, the entire content of the
tape is extracted. Note that if multiple entries
specifying the same file are on the tape, the last
one overwrites all earlier.
t The names of the specified files are listed each
time they occur on the tape. If no file argument
is given, all of the names on the tape are listed.
u The named files are added to the tape if either
they are not already there or have been modified
since last put on the tape.
c Create a new tape; writing begins on the beginning
of the tape instead of after the last file. This
command implies r.
o On output, tar normally places information speci-
fying owner and modes of directories in the
archive. Former versions of tar, when encounter-
ing this information will give error message of
the form
"<name>/: cannot create".
This option will suppress the directory informa-
tion.
p This option says to restore files to their origi-
nal modes, ignoring the present umask(2). Setuid
and sticky information will also be restored to
the super-user.
1
TAR(1) UNIX Programmer's Manual TAR(1)
The following characters may be used in addition to the
letter which selects the function desired.
0,...,7 This modifier selects an alternative drive on
which the tape is mounted. (The default is
drive 0 at 1600 bpi, which is normally
/dev/nrtc.)
v Normally _▶08◀t_▶08◀a_▶08◀r 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.
w causes _▶08◀t_▶08◀a_▶08◀r to print the action to be taken fol-
lowed by file name, then wait for user confirma-
tion. If a word beginning with `y' is given, the
action is performed. Any other input means don't
do it.
f causes _▶08◀t_▶08◀a_▶08◀r to use the next argument as the name
of the archive instead of /dev/rmt?. If the name
of the file is `-', tar writes to standard out-
put or reads from standard input, whichever is
appropriate. Thus, _▶08◀t_▶08◀a_▶08◀r can be used as the head
or tail of a filter chain _▶08◀T_▶08◀a_▶08◀r can also be used
to move hierarchies with the command
cd fromdir; tar cf - . | (cd todir; tar xf -)
b causes _▶08◀t_▶08◀a_▶08◀r to use the next argument as the
blocking factor for tape records. The default is
20 (the maximum). This option should only be
used with raw magnetic tape archives (See f
above). The block size is determined automati-
cally when reading tapes (key letters `x' and
`t').
l tells _▶08◀t_▶08◀a_▶08◀r to complain if it cannot resolve all
of the links to the files dumped. If this is not
specified, no error messages are printed.
m tells _▶08◀t_▶08◀a_▶08◀r to not restore the modification times.
The mod time will be the time of extraction.
Previous restrictions dealing with _▶08◀t_▶08◀a_▶08◀r's inability to
properly handle blocked archives have been lifted.
FILES
/dev/rmt?
/tmp/tar*
DIAGNOSTICS
Complaints about bad key characters and tape read/write
errors.
Complaints if enough memory is not available to hold the
link tables.
2
TAR(1) UNIX Programmer's Manual TAR(1)
BUGS
There is no way to ask for the _▶08◀n-th occurrence of a file.
Tape errors are handled ungracefully.
The u option can be slow.
The current limit on file name length is 100 characters.
3