off the shelf tar xvf no - required so perhaps its a bsdish thingey. I am running a bsdish thingey so man tar
NAME
tar - tape archiver
SYNOPSIS
tar [-]{crtux}[befhmopvwzHLPXZ014578] [archive] [blocksize] [-C directory
] [-s replstr ] file1 [file2...]
DESCRIPTION
The tar command creates, adds files to, or extracts files from an archive
file in tar format. A tar archive is often stored on a magnetic tape,
but can be a floppy or a regular disk file.
One of the following flags must be present:
-c Create new archive, or overwrite an existing archive,
adding the specified files to it.
-r Append the named new files to existing archive. Note that
this will only work on media on which an end-of-file mark
can be overwritten.
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must be the LSD
thanx,
bill