it does work without the "f" as i understand, since bzcat sends the file to stdout uncompressed, tar doesn't need a filename to look for. it's already getting the file info through the 'pipe' > -----Original Message----- > From: Garl R. Grigsby [SMTP:[EMAIL PROTECTED]] > Sent: Monday, March 12, 2001 9:00 AM > To: [EMAIL PROTECTED] > Subject: [EUG-LUG:384] Re: Specific questions on tar, gzip, and > ipchains > > Cory, > To get the command you mentioned below to work you have to add a '-': > > bzcat foo.bar.tar.bz | tar xf - > > It may work without the 'f' but I am not sure. > > Garl > > Cory Petkovsek wrote: > > > The tar's vary across versions of unix as well. > > > > There are some cool shortcuts with linux's tar, like using sdtin/stdout: > > > > bzcat kernel.tar.bz2 | tar x > > > > This works on linux. However the tar on SunOS 5.8 (UofO CS dept) won't > work with stdin. (At least I haven't figured out how to do it.) To get > the same result as above, I have to do this: > > > > bzcat kernel.tar.bz2 > kernel.tar ; tar xf kernel.tar && rm kernel.tar > > > > Note executing: > > bzcat kernel.tar.bz2 | tar x (or with gzip: tar xfz > kernel.tgz) > > will leave the kernel.tar.bz2(.tgz) file as is, extract the files > within, and nowhere does the kernel.tar file appear. > > > > bunzip2 kernel.tar.bz2 > > will delete the original archive, and leave 'kernel.tar', which is why I > used bzcat above. Same thing with gunzip, unless some parameters are > specified to say, don't delete the original archive (but I haven't figured > out what those are). bzcat/zcat will leave the file, outputting the > uncompressed tar information to stdout (standard out, which can then be > redirected with > or | ). > > > > For sunos5.8, there is a bunch of monkeying with the file kernel.tar to > produce the same result as the linux command above. This is due to sun's > tar (seemingly) not accepting stdinput and requiring the data in a file. > > > > bzip2 and gzip are two different compression techniques, incompatible > with eachother. gzip has been incorporated into the linux (and others) > tar command. Tar calls gzip I believe, rather than incorporating gzip > code directly. > > > > for a gzipped file, > > zcat file.tgz | tar x > > is equivalent to > > tar xfz file.tgz > > > > trying to do this > > tar xfz file.tar.bz2 > > WON'T WORK, at least until a new version of tar comes out. > > > > Here's something I learned from Pat, using tar and ssh to copy a host of > files from one computer to another via a secure channel: > > > > tar czp somedir/files | ssh -l frank computer.com "tar xzp" > > create an archive, passing 'files' through gzip, and retaining > permissions (p), and output that to standard out. Redirect that to ssh, > login as frank to computer.com and run "tar xzp". Extract info coming > from standard in, passing it through gunzip, and restoring the files and > their permissions (p). > > > > But here's another way, part of the ssh package, scp: > > scp -Crq somedir [EMAIL PROTECTED]: > > secure copy with compression (-C) all subdirectories (-r) to > computer.com. Log in as 'frank' and store files/subdirs in his home dir > (:). And don't display the progress meter (-q). > > > > I think the tar version is much faster though: > > cory@cory-l:~$ time tar czp devl | ssh petersen-arne.com "tar xzp" > > real 0m37.957s > > cory@cory-l:~$ time scp -Crq devl [EMAIL PROTECTED]: > > real 1m19.797s > > > > Cory > > > > On Sun, Mar 11, 2001 at 06:46:13PM -0800, Dean Ridgway wrote: > > > Greetings All, > > > > > > >untar and unzip a .tgz .tar.gz or something similar: > > > > > > > >tar xfz <file.tar.gz> > > > > > > > >x means xtract, f means file, z means pass through gzip to decompress > > > > > > > >to create a .tar.gz file: > > > >tar cfz <file.tgz> <files to compress and tar> > > > > > > Note: on some versions of tar the order of the parameters is > important. > > > I.e. the 'f' parameter (for file) needs to be followed by the actual > file > > > name (example tar xzf <file.tar.gz> and tar czf <file.tgz>). > > > > > > Also the file extensions .tar.gz and .tgz are used interchangably. > > > > > > /\-/\ Dean Ridgway | Two roads diverged in a wood, > and I- > > > ( - - ) InterNet [EMAIL PROTECTED] | I took the one less traveled > by, > > > =\_v_/= FidoNet 1:357/1.103 | And that has made all the > difference. > > > CIS 73225,512 | "The Road Not Taken" - > Robert Frost. > > > http://www.peak.org/~ridgwad/ > > > PGP mail encouraged, finger for key: 28C577F3 2A5655AFD792B0FB > 9BA31E6AB4683126 > > -- > ========================================================================== > === > Garl R. Grigsby > Senior Customer Applications Engineering - Analysis Team > -------------------------------------------------------------------------- > --- > Structural Dynamics Research Corporation Phone: (800)242-7372 > TAO Americas Support Center FAX: (541)342-8277 > 1750 Willow Creek Circle Email: > [EMAIL PROTECTED] > Eugene, OR 97402 Internet: > http://www.sdrc.com > ========================================================================== > === > -FEA makes a good engineer great, and a poor engineer dangerous- > ========================================================================== > === > PGP ID: 0xF2D845E7 > PGP Fingerprint: 9C40 CB5E 1C51 CF58 E3F9 3F2C 8F1F F3EF F2D8 45E7 > ========================================================================== > ===
