????1??tar ?????????????????????????????(tape archive)?????????tar;
????tar ?????????????????????????
????tar??????????????????????????????gzip????bzip2???????.
?????????.tar.gz??β??????gzip????????.tar.bz2??β??????bzip2?????.
????tar ??????????д??????????????.tar???
????gzip bzip2 ????????????????tar ???????
??????tar?????п?????????gzip bzip2
????#tar tvzf  /tmp/my_home_directory.tar.gz           //z  ??? gzip
????#tar tvjf   /tmp/my_home_directory.tar.bz2         //j   ???bzip2
??????? gzip???bzip2??????bzip2????? gzip????????
????2??gzip(gzip??gunzip??zcat-compress or expand files)??
??????GNUzip????д?????????GNU(?????GNU's Not Unix)???????????????????;
????#tar tvzf   /tmp/my_home_directory.tar.gz           //z  ??? gzip????????f?????????
????3??bzip2(bzip2??bunzip2-a block-sorting file compressor??)
?????????????Burrows-Wheeler ?任?????????????????Ч????????LZ77/LZ78????????ú?;
????#tar tvjf   /tmp/my_home_directory.tar.bz2         //j   ???bzip2????????f?????????
????4?? *.Z---compress??????????????
????compress???????????? unix ??????????????????????????? .Z ????????????δ??????
??????????????????????? uncompress ????? ????????????????????????????????????? tar ???????????
???????? gzip ?????????????????????????????????? gzip ????????????;
????5?? *.tar.gz------ tar ????????????????в?????? gzip?????
????6?? *.tar.bz2------tar ????????????????в?????? bzip2 ????
????>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
??????? gzip ???????? compress ????????????????????????? bzip2 ?????????? gzip ????
?????????????????????? bzip2 ???????????????? gzip ????á?????bzip2 ???÷??????? gzip ?????