02-07-2019
Quote:
Originally Posted by
rakeshp
Hi Don, ... In your code you considered only non numeric and not space special character. Please correct it to alphanumeric.
Hi rakeshp,
after 21 posts in this thread I think it is time that
YOU start to take the responsibilty for
YOUR problem, and don't request solution atop solution from people in here with repeated careless, insufficient, contradictory, and misleading specifications. Everything is at your fingertips:
- a plethora of sample scripts
- comments on how to improve
- man pages of the relevant tools
- internet searches
How about carefully rereading and
understanding all posts, applying what you learned in them, and combining / modifying / adapting the code snippets given in this thread to a satisfying solution?
Last edited by RudiC; 02-07-2019 at 05:30 AM..
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LEARN ABOUT CENTOS
amanda-archive-format
AMANDA-ARCHIVE-FOR(5) File formats and conventions AMANDA-ARCHIVE-FOR(5)
NAME
amanda-archive-format - Format of amanda archive streams
DESCRIPTION
The Amanda archive format is designed to be a simple, efficient means of interleaving multiple simultaneous files, allowing an arbitrary
number of data streams for a file. It is a streaming format in the sense that the writer need not know the size of files until they are
completely written to the archive, and the reader can process the archive in constant space.
DATA MODEL
The data stored in an archive consists of an unlimited number of files. Each file consists of a number of "attributes", each identified by
a 16-bit ID. Each attribute can contain an unlimited amount of data.
Attribute IDs less than 16 (AMAR_ATTR_APP_START) are reserved for special purposes, but the remaining IDs are available for
application-specific uses.
STRUCTURE
RECORDS
A record can be either a header record or a data record. A header record serves as a "checkpoint" in the file, with a magic value that can
be used to recognize archive files.
A header record has a fixed size of 28 bytes, as follows:
28 bytes: magic string
The magic string is the ASCII text "AMANDA ARCHIVE FORMAT " followed by a decimal representation of the format version number (currently
'1'), padded to 28 bytes with NUL bytes.
A data record has a variable size, as follows:
2 bytes: file number
2 bytes: attribute ID
4 bytes: data size (N)
N bytes: data
The file number and attribute ID serve to identify the data stream to which this data belongs. The low 31 bits of the data size give the
number of data bytes following, while the high bit (the EOA bit) indicates the end of the attribute, as described below. Because records
are generally read into memory in their entirety, the data size must not exceed 4MB (4194304 bytes). All integers are in network byte
order.
A header record is distinguished from a data record by the magic string. The file number 0x414d, corresponding to the characters "AM", is
forbidden and must be skipped on writing.
Attribute ID 0 (AMAR_ATTR_FILENAME) gives the filename of a file. This attribute is mandatory for each file, must be nonempty, must fit in
a single record, and must precede any other attributes for the same file in the archive. The filename should be a printable string (ASCII
or UTF-8), to facilitate use of generic archive-display utilities, but the format permits any nonempty bytestring. The filename cannot span
multiple records.
Attribute ID 1 (AMAR_ATTR_EOF) signals the end of a file. This attribute must contain no data, but should have the EOA bit set.
CONNECTION TO DATA MODEL
Each file in an archive is assigned a file number distinct from any other active file in the archive. The first record for a file must have
attribute ID 0 (AMAR_ATTR_FILENAME), indicating a filename. A file ends with an empty record with ID 1 (AMAR_ATTR_EOF). For every file at
which a reader might want to begin reading, the filename record should be preceded by a header record. How often to write header records is
left to the discretion of the application.
All data records with the same file number and attribute ID are considered a part of the same attribute. The boundaries between such
records are not significant to the contents of the attribute, and both readers and writers are free to alter such boundaries as necessary.
The final data record for each attribute has the high bit (the EOA bit) of its data size field set. A writer must not reuse an attribute ID
within a file. An attribute may be terminated by a record containing both data and an EOA bit, or by a zero-length record with its EOA bit
set.
SEE ALSO
amanda(8), amanda(8)
The Amanda Wiki: : http://wiki.zmanda.com/
AUTHOR
Dustin J. Mitchell <dustin@zmanda.com>
Zmanda, Inc. (http://www.zmanda.com)
Amanda 3.3.3 01/10/2013 AMANDA-ARCHIVE-FOR(5)