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Pax--Notes

Like other POSIX programs, pax is unable to access tape drives. It can only be used to read and write archive files on disk drives. Pax reads and writes archive files which conform to the Archive/Interchange File Format specified in IEEE Std. 1003.1-1988. Pax can also read, but not write, a number of other file formats in addition to those specified in the Archive/Interchange File Format description. Support for these traditional file formats, such as V7 tar and System V binary cpio format archives, is provided for backward compatibility and to maximize portability.

If neither the -r or -w options are given, then pax will list the contents of the specified archive. In this mode, pax lists normal files one per line, hard link pathnames as

pathname == linkname

and symbolic link pathnames (if supported by the implementation) as

pathname -> linkname

where pathname is the name of the file being extracted, and linkname is the name of a file which appeared earlier in the archive.

If the -v option is specified, then pax list normal path names in the same format used by the ls utility with the -l option. Hard links are shown as

<ls -l listing> == linkname

and symbolic links (if supported) are shown as

<ls -l listing> -> linkname

Upon detecting an end of medium on an archive which is not yet completed, pax will prompt the user for the next volume of the archive and will allow the user to specify the location of the next volume.

When writing to an archive, the standard input is used as a list of pathnames if no pathname operands are specified. The format is one pathname per line. Otherwise, the standard input is the archive file, which is formatted according to one of the specifications in Archive/Interchange File format in IEEE Std. 1003.1-1988, or some other implementation-defined format.

The user ID and group ID of the process, together with the appropriate privileges, affect the ability of pax to restore ownership and permissions attributes of the archived files. (See format-reading utility in Archive/Interchange File Format in IEEE Std. 1003.1-1988.)

The options -a, -c, -d, -i, -l, -p, -t, -u, and -y are provided for functional compatibility with the historical cpio and tar utilities. The option defaults were chosen based on the most common usage of these options, therefore, some of the options have meanings different than those of the historical commands.

More Information About Pax

ntcmds00000001.gif Pax--Example

ntcmds00000001.gif Pax

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