Hi Xinyou, On Sun, Sep 4, 2011 at 4:53 PM, xinyou yan <yxy.716@xxxxxxxxx> wrote: >> I am not sure what the problem is. >> The following works for me: >> tar cf archive.tar first >> tar -rf archive.tar second > Yes it can , But tar czf tar rzf can't work > Second : > > if I use > gzip -c file1 >> yyy.test > How can I unpress yyy.test to file1 as file1 > I test like it > gzip -c test1 > 1.test > We can use > > gunzip -c 1.test >test1 > > to achieve my answer . > However : > gzip -c test1 >> 1.test > gzip -c test2 >> 1.test > > I just gunzip -c 1.test > test1 (the size of test1 now is the sum > test1 and test2 before) > > How can i use gunzip to separate the two file ? > I wonder >> can remember there are two file ? I think you are mixing up compression and archiving as similar things. They should be done in a particular order: 1. to create: archive -> compress 2. to modify: decompress -> modify archive -> compress 3. restore: decompress -> unarchive Now (1) and (3) can be done in one step using the -z or -j option to tar, however for (2) you need to decompress first using `gunzip' or `gzip -d' before you can use `tar -r -f <archivefile.tar>' to modify it. To give you an example: $ tar -czf backup.tar.gz *.org # backup all .org files $ tar -tzf backup.tar.gz # test if it worked analysis.org coding.org fiddle.org languages.org meetings.org notes.org org-help.org $ gunzip backup.tar.gz # decompress the compressed archive $ tar -rf backup.tar *.org_archive # add .org_archive files $ gzip backup.tar # compress modified archive $ tar -tzf backup.tar.gz # test again analysis.org coding.org fiddle.org languages.org meetings.org notes.org org-help.org analysis.org_archive meetings.org_archive notes.org_archive $ tar -xzf backup.tar.gz '*.org' # restore only .org files $ ls analysis.org backup.tar.gz coding.org fiddle.org languages.org meetings.org notes.org org-help.org In the future I would recommend try going through the manual page for tar and gzip carefully (`man tar' and `man gzip'). I hope this helps. -- Suvayu Open source is the future. It sets us free. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
