2011/9/4 suvayu ali <fatkasuvayu+linux@xxxxxxxxx>: > 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. Yes it is very clear , you suggestion is good . By the way , I said before gzip with >> can be achieved ? gzip -c make the file be compressed to standout , then redirect , Can we decompress it with some method ? > > -- > 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 > -- ---------------------------------------------------------------- 嘉谟之行 "昔我往矣，杨柳依依 ； 今我来思 ，雨雪霏霏" ---------------------------------------------------------------- -- 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
