Fedora And Red Hat System Administration/Archives And Compression
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[edit] Compressing Data
Under Construction
[edit] gzip and gunzip
Under Construction
[edit] bzip2 and bunzip2
Under Construction
[edit] tar - *NIX Archives
Under Construction
[edit] Creating a tar archive
Under Construction
[edit] Inspecting a tar archive
Under Construction
[edit] Extracting a tar archive
Under Construction
[edit] cpio - Flexible Archiving Tool
In general, tar is the preferred method for creating archives, but in some cases a particular archive format may be desired and cpio provides a greater degree of control over how the archive is generated at the cost of greater complexity.
[edit] Creating a cpio archive
To create a cpio archive, the -o option is provided (think 'o' for "The archive is being written out"). cpio expects a list of files to be provided to its standard input. The list of files is usually provided by piping results from the find command. The -H option can be used to specify the archive format, see the man page for more information.
[user@station user]$ find playground/ playground/ playground/AUTHORS playground/ChangeLog playground/COPYING playground/foo.txt playground/newfile [user@station user]$ find playground/ | cpio -o >archive 1212 blocks [user@station user]$ ls -l archive -rw-rw-r-- 1 user user 620544 Jan 5 08:49 archive [user@station user]$ file archive archive: cpio archive
[edit] Listing contents of an archive with cpio
To view the contents of an archive the -i option is provided to tell cpio to expect the archive data on its standard input. The -t option is also used then to tell cpio to not extract, but rather simply list the contents of the archive.
[user@station user]$ cpio -it <archive playground/ playground/AUTHORS playground/ChangeLog playground/COPYING playground/foo.txt playground/newfile 1212 blocks
[edit] Extracting an archive with cpio
The -i option is used with a combination of options to tell it how to extract. Common choices include -d to tell cpio to create directories as needed. -m to reset file modification times. -R to change file ownership.
[user@station user]$ cd /tmp [user@station tmp]$ cpio -idm <archive 1212 blocks [user@station tmp]$ find playground/ playground/ playground/AUTHORS playground/ChangeLog playground/COPYING playground/foo.txt playground/newfile
[edit] zip - PKZIP style archives
[edit] Creating a zip archive
[user@station user]$ zip -r playground.zip playground adding: playground/ (stored 0%) adding: playground/AUTHORS (deflated 63%) adding: playground/COPYING (deflated 62%) adding: playground/foo.txt (stored 0%) adding: playground/newfile (deflated 39%) adding: playground/ChangeLog (deflated 70%) [user@station user]$ ls -l playground.zip -rw-r--r-- 1 user user 71607 Jan 11 14:33 playground.zip
[edit] Listing contents of a zip archive
[user@station user]$ unzip -l playground.zip
Archive: playground.zip
Length Date Time Name
-------- ---- ---- ----
0 01-11-05 14:33 playground/
2110 01-11-05 14:32 playground/AUTHORS
17992 01-11-05 14:33 playground/COPYING
22 01-11-05 14:33 playground/foo.txt
44 01-11-05 14:33 playground/newfile
212169 01-11-05 14:32 playground/ChangeLog
-------- -------
232337 6 files
[edit] Unpacking a zip archive
[user@station user]$ rm -rf playground [user@station user]$ unzip playground.zip Archive: playground.zip creating: playground/ inflating: playground/AUTHORS inflating: playground/COPYING extracting: playground/foo.txt inflating: playground/newfile inflating: playground/ChangeLog
[edit] dump - Filesystem Level Backup
Under Construction
