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Full Discussion: Delete Old files from Tar
Top Forums UNIX for Beginners Questions & Answers Delete Old files from Tar Post 303045283 by MadeInGermany on Sunday 15th of March 2020 09:29:49 AM
Old 03-15-2020
pax can do some modifactions on a tar stream.
Code:
man pax

 

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Archive::Tar::File(3pm) 				 Perl Programmers Reference Guide				   Archive::Tar::File(3pm)

NAME
Archive::Tar::File - a subclass for in-memory extracted file from Archive::Tar SYNOPSIS
my @items = $tar->get_files; print $_->name, ' ', $_->size, " " for @items; print $object->get_content; $object->replace_content('new content'); $object->rename( 'new/full/path/to/file.c' ); DESCRIPTION
Archive::Tar::Files provides a neat little object layer for in-memory extracted files. It's mostly used internally in Archive::Tar to tidy up the code, but there's no reason users shouldn't use this API as well. Accessors A lot of the methods in this package are accessors to the various fields in the tar header: name The file's name mode The file's mode uid The user id owning the file gid The group id owning the file size File size in bytes mtime Modification time. Adjusted to mac-time on MacOS if required chksum Checksum field for the tar header type File type -- numeric, but comparable to exported constants -- see Archive::Tar's documentation linkname If the file is a symlink, the file it's pointing to magic Tar magic string -- not useful for most users version Tar version string -- not useful for most users uname The user name that owns the file gname The group name that owns the file devmajor Device major number in case of a special file devminor Device minor number in case of a special file prefix Any directory to prefix to the extraction path, if any raw Raw tar header -- not useful for most users Methods Archive::Tar::File->new( file => $path ) Returns a new Archive::Tar::File object from an existing file. Returns undef on failure. Archive::Tar::File->new( data => $path, $data, $opt ) Returns a new Archive::Tar::File object from data. $path defines the file name (which need not exist), $data the file contents, and $opt is a reference to a hash of attributes which may be used to override the default attributes (fields in the tar header), which are described above in the Accessors section. Returns undef on failure. Archive::Tar::File->new( chunk => $chunk ) Returns a new Archive::Tar::File object from a raw 512-byte tar archive chunk. Returns undef on failure. $bool = $file->extract( [ $alternative_name ] ) Extract this object, optionally to an alternative name. See "Archive::Tar->extract_file" for details. Returns true on success and false on failure. $path = $file->full_path Returns the full path from the tar header; this is basically a concatenation of the "prefix" and "name" fields. $bool = $file->validate Done by Archive::Tar internally when reading the tar file: validate the header against the checksum to ensure integer tar file. Returns true on success, false on failure $bool = $file->has_content Returns a boolean to indicate whether the current object has content. Some special files like directories and so on never will have any content. This method is mainly to make sure you don't get warnings for using uninitialized values when looking at an object's content. $content = $file->get_content Returns the current content for the in-memory file $cref = $file->get_content_by_ref Returns the current content for the in-memory file as a scalar reference. Normal users won't need this, but it will save memory if you are dealing with very large data files in your tar archive, since it will pass the contents by reference, rather than make a copy of it first. $bool = $file->replace_content( $content ) Replace the current content of the file with the new content. This only affects the in-memory archive, not the on-disk version until you write it. Returns true on success, false on failure. $bool = $file->rename( $new_name ) Rename the current file to $new_name. Note that you must specify a Unix path for $new_name, since per tar standard, all files in the archive must be Unix paths. Returns true on success and false on failure. $bool = $file->chmod $mode) Change mode of $file to $mode. The mode can be a string or a number which is interpreted as octal whether or not a leading 0 is given. Returns true on success and false on failure. $bool = $file->chown( $user [, $group]) Change owner of $file to $user. If a $group is given that is changed as well. You can also pass a single parameter with a colon separating the use and group as in 'root:wheel'. Returns true on success and false on failure. Convenience methods To quickly check the type of a "Archive::Tar::File" object, you can use the following methods: $file->is_file Returns true if the file is of type "file" $file->is_dir Returns true if the file is of type "dir" $file->is_hardlink Returns true if the file is of type "hardlink" $file->is_symlink Returns true if the file is of type "symlink" $file->is_chardev Returns true if the file is of type "chardev" $file->is_blockdev Returns true if the file is of type "blockdev" $file->is_fifo Returns true if the file is of type "fifo" $file->is_socket Returns true if the file is of type "socket" $file->is_longlink Returns true if the file is of type "LongLink". Should not happen after a successful "read". $file->is_label Returns true if the file is of type "Label". Should not happen after a successful "read". $file->is_unknown Returns true if the file type is "unknown" perl v5.18.2 2014-01-06 Archive::Tar::File(3pm)

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