convert [-x] infile outfile
The convert command transforms input infile to output outfile. infile must be a UNIX System V Release 1.0 archive file format and outfile will be the current archive file format (see ar(4)). All other types of input to the convert command will be passed unmodified from the input file to the output file (along with appropriate warning messages).
The -x option is required to convert an archive file created on a XENIX system. Using this option will convert the general archive but leave archive members unmodified.
infile must be different from outfile.
TMPDIR is usually /var/tmp but can be redefined by setting the environment variable TMPDIR (see tempnam in tmpnam(3S)).