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Full Discussion: Extracting file from .tar.gz file
Top Forums Shell Programming and Scripting Extracting file from .tar.gz file Post 302836663 by Don Cragun on Wednesday 24th of July 2013 01:11:50 PM
Old 07-24-2013
Quote:
Originally Posted by Corona688
You don't need to store the entire decompressed file on disk.

Code:
gunzip -c < file.tar.gz | tar -xf - filename1 filename2 filename3

Or on some systems, just
Code:
tar -zxf file.tar.gz filename1 filename2 filename3

As far as I know you can't extract all files beginning with a certain string though.

It has to scan the whole file to find the ones you want.
True, but you can make one pass to get the names of the files in the tar archive and save the names of the files you want using grep (or some other tool) and then extract the files you want on a second pass. The 1st pass would be something like:
Code:
tar -ztf file.tar.gz | grep -E '(^|/)D.*T(/|$)'

Again, this does not save the entire uncompressed archive to disk. And, of course, if you try this and find that it gives you the list of files you want, you could try:
Code:
tar -zxf file.tar.gz $(tar -ztf file.tar.gz | grep -E '(^|/)D.*T(/|$)')

as long as the list of filenames to be processed doesn't cause that command line to overflow your system's ARG_MAX limit.
 

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LEARN ABOUT FREEBSD

archive_write_set_format_pax

ARCHIVE_WRITE_FORMAT(3) 				   BSD Library Functions Manual 				   ARCHIVE_WRITE_FORMAT(3)

NAME

     archive_write_set_format_cpio, archive_write_set_format_pax, archive_write_set_format_pax_restricted, archive_write_set_format_shar,
     archive_write_set_format_shar_dump, archive_write_set_format_ustar -- functions for creating archives

LIBRARY

     Streaming Archive Library (libarchive, -larchive)

SYNOPSIS

     #include <archive.h>

     int
     archive_write_set_format_cpio(struct archive *);

     int
     archive_write_set_format_pax(struct archive *);

     int
     archive_write_set_format_pax_restricted(struct archive *);

     int
     archive_write_set_format_shar(struct archive *);

     int
     archive_write_set_format_shar_dump(struct archive *);

     int
     archive_write_set_format_ustar(struct archive *);

DESCRIPTION

     These functions set the format that will be used for the archive.

     The library can write POSIX octet-oriented cpio format archives, POSIX-standard ``pax interchange'' format archives, traditional ``shar'' ar-
     chives, enhanced ``dump'' shar archives that store a variety of file attributes and handle binary files, and POSIX-standard ``ustar'' ar-
     chives.  The pax interchange format is a backwards-compatible tar format that adds key/value attributes to each entry and supports arbitrary
     filenames, linknames, uids, sizes, etc.  ``Restricted pax interchange format'' is the library default; this is the same as pax format, but
     suppresses the pax extended header for most normal files.	In most cases, this will result in ordinary ustar archives.

RETURN VALUES

     These functions return ARCHIVE_OK on success, or ARCHIVE_FATAL.

ERRORS

     Detailed error codes and textual descriptions are available from the archive_errno() and archive_error_string() functions.

SEE ALSO

     tar(1), libarchive(3), archive_write(3), archive_write_set_options(3), cpio(5), mtree(5), tar(5)

BSD
								 February 2, 2012							       BSD
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