HP OpenVMS Systems Documentation

An element list is a list of arguments specified with a command or qualifier. The arguments, or elements, in the list are separated by commas. Element lists relating to input or output specifiers are allowed only in the following circumstances:

• If an input specifier refers to a Files--11 disk, you can construct lists from standard OpenVMS file specifications, as follows:

  $ BACKUP _From: DUA0:[DATA]A.DAT,B.DAT,[PROGRAMS]TEST.EXE _To: MSA0:TEST.SAV/LABEL=DLY101

• If an input specifier or an output specifier refers to a BACKUP save set on magnetic tape or sequential disk, you can specify more than one device name to be used in the operation. This allows you to process multivolume save sets efficiently by specifying the order in which devices will be used. The first volume is processed until it is full. The second (or subsequent) volume is processed while the media in the first (or previous) volume is being changed. However, the save-set name must appear with the first element in the list and must not appear in subsequent elements in the list.
  In the following example, BACKUP first saves data to a tape in drive MSA0, then to a tape in drive MSA1. When the tape in drive MSA1 is full, BACKUP saves data to a fresh tape in MSA0.

  $ BACKUP _From: DUA0:[DATA]*.*,DUA0:[PROGRAMS]*.* _To: MSA0:TEST.SAV,MSA1:/LABEL=WKLY01

• If you are performing an image operation on a volume set, you can specify element lists in the input and output specifiers. In the following example, BACKUP first restores the save set TEST.SAV from the tape in drive MSA0, and then continues to restore the save set from the tape in drive MSA1. BACKUP first restores this save set to DUA0. When DUA0 is full, BACKUP continues the restore operation to DUA1.

  $ BACKUP/IMAGE _From: MSA0:TEST.SAV,MSA1: _To: DUA0:[DATA...],DUA1:

You can also affect BACKUP operations by specifiying qualifiers. BACKUP has five types of qualifiers:

• Command qualifiers modify the default action of a BACKUP command. You can place command qualifiers anywhere in the command line. Command qualifiers act upon every file in the input or output specifier.
• Input file-selection qualifiers select files from the input specifier. Place them immediately after the input specifier.
• Input save-set qualifiers affect the way BACKUP handles an input save set during a restore or compare operation. Place them immediately after the input specifier.
• Output file qualifiers change the way output files are restored. Place them immediately after the output specifier.
• Output save-set qualifiers affect the way BACKUP processes an output save set during a save operation. Place them immediately after the output specifier.

It is important to understand the differences between the types of qualifiers. The position of qualifiers in the BACKUP command line affects the results of the command. Although command qualifiers can be placed anywhere in the command line, input- and output-specifier qualifiers are position-dependent. That is, input-specifier qualifiers must be placed immediately after the input specifier, and output-specifier qualifiers must be placed immediately after the output specifier.

Additionally, several BACKUP qualifiers are both input-specifier qualifiers and output-specifier qualfiers. To achieve the results you want from a BACKUP command, ensure that you place position-dependent qualifiers correctly. For example, use the /SAVE_SET qualifier as an output save-set qualifier in a BACKUP save operation and as an input save-set qualifier in a BACKUP restore operation.

Appendix G contains more information about valid combinations of BACKUP qualifiers.

7.3.3 Using Wildcard Characters with BACKUP

BACKUP allows you to use wildcard characters in file specifications to represent directories, file names, file types, and version numbers. Omitted file names, file types, or version numbers are assumed to be the asterisk wildcard character (*). For instance, if you omit the version number, BACKUP processes all versions. (For introductory information about wildcard characters, refer to the OpenVMS User's Manual.)

You can use any valid DCL wildcard character with input specifiers that are Files--11 media or with the /SELECT and /EXCLUDE qualifiers. Note, however, that the symbols denoting the latest versions of files (;) and relative versions of files (;-n) are processed as the asterisk wildcard character (;*) when they are used with the /EXCLUDE and /SELECT qualifiers.

You cannot use wildcard characters in BACKUP save-set specifications unless the save sets are input specifiers on tape.

Using Wildcard Characters to Represent Directories

The following table lists the types of directory wildcards allowed for output specifiers that are Files--11 media.

The following example uses the directory wildcard format [directory...] for both the input and the output specifiers:

$ BACKUP [OSCAR...] [JOE.RECEIVED...]

In this example, BACKUP creates a directory named [JOE.RECEIVED] (if it does not already exist) as well as subdirectories that correspond to the subdirectories of [OSCAR]. BACKUP copies all files from the directory [OSCAR] and its subdirectories to [JOE.RECEIVED] and its subdirectories. If [OSCAR] has eight levels of directories, however, BACKUP is unable to create a corresponding ninth-level subdirectory to [JOE.RECEIVED]; the eighth-level subdirectory to [OSCAR] is not copied.

If you use the asterisk wildcard character (*) to represent subdirectories in the input specifier of a copy operation, BACKUP creates subdirectories to the directory specified in the output specifier that correspond to the subdirectories in the input specifier. BACKUP then copies all files from the lowest level subdirectory in the input specifier to the lowest level subdirectory in the output specifier. In the following example, the asterisk represents subdirectories named MONDAY and TUESDAY:

$ BACKUP [SAM.WORK.*.WEDNESDAY] [JAMES...]

In this example, BACKUP creates a subdirectory named [JAMES.MONDAY.TUESDAY.WEDNESDAY]. In doing so, BACKUP copies the file MONDAY.DIR to [JAMES], copies the file TUESDAY.DIR to [JAMES.MONDAY], and copies the file WEDNESDAY.DIR to [JAMES.MONDAY.TUESDAY]. Then BACKUP copies all files from [SAM.WORK.MONDAY.TUESDAY.WEDNESDAY] to [JAMES.MONDAY.TUESDAY.WEDNESDAY].

In a restore operation, the input specifier defaults to [*...] if the input save-set qualifier /SELECT is not used; this is important if you use the form [directory...] in the output specifier. The function of the wildcard [*...] is to carry over the entire directory name from the first level on and to place it before the ellipsis in the output specifier. Thus, if the save set in the following example contains the directory tree [SAVE...], the restored directory tree will be [WORK.SAVE...]:

$ BACKUP MTA0:SAVE.BCK [WORK...]

Note that the result will be the same, even if your output specifier has the same name as the directory in the input specifier, as shown in the following example:

$ BACKUP MTA0:SAVE.BCK [SAVE...]

The preceding command restores the directory tree [SAVE...] to a directory tree named [SAVE.SAVE...].

The following command restores the directory tree [SAVE...] to a directory tree named [WORK...]:

$ BACKUP MTA0:SAVE.BCK/SELECT=[SAVE...] [WORK...]

There are two ways to retain the original directory name when you restore files. You must either use the form [*...] for the output specifier, or you must specify the input save-set qualifier /SELECT. The following example uses the form [*...] in the output specifier to restore the directory tree [SAVE...] in save set SAVE.BCK to the directory tree [SAVE...]:

$ BACKUP MTA0:SAVE.BCK [*...]

The input save-set qualifier /SELECT causes only the ellipsis portion of the selected file specification to be carried over to the directory tree named in the output specifier [directory...]. The following command restores [SAVE...] to [SAVE...]:

$ BACKUP MTA0:SAVE.BCK/SELECT=[SAVE...] [SAVE...]

By duplicating files or volumes of files, the Backup utility (BACKUP) protects data from loss or corruption.

BACKUP is intended for use primarily by system managers and operators to protect public media. However, anyone can use BACKUP to make personal BACKUP copies and to transport files between OpenVMS systems.

The two ways to back up your system disk are:

• If you have access to the CD-ROM of the current version of OpenVMS Alpha or VAX, you can use a menu-driven procedure to back up your system disk.
• If you do not have access to the CD-ROM of the current version of OpenVMS Alpha or VAX, you must use standalone BACKUP to back up your system disk. Standalone BACKUP is a version of the Backup utility that is bootstrapped into main memory instead of running under the control of the OpenVMS VAX operating system. Standalone BACKUP uses a subset of BACKUP qualifiers to perform image and physical BACKUP operations.

Format

BACKUP input-specifier output-specifier

Parameters

input specifier

Specifies the input for the BACKUP operation. The input specifier can be a standard OpenVMS file specification, a BACKUP save-set specification, or a device name. If the input specifier is a save-set specification on disk, it must include the input save-set qualifier /SAVE_SET.

DECnet node names are allowed only in save-set specifications.

Wildcards are permitted in standard OpenVMS file specifications and in save-set specifications if they are on magnetic tape.

output specifier

Specifies the output for the BACKUP operation. The output specifier, like the input specifier, can be either a standard OpenVMS file specification, a BACKUP save-set specification, or a device name. If the output specifier is a save set on disk, it must include the output save-set qualifier /SAVE_SET.

DECnet node names are allowed only in save-set specifications.

You can use wildcard characters if the output specifier is a Files--11 volume. You cannot use wildcard characters if the output specifier is a BACKUP save set or a volume created by a BACKUP/PHYSICAL or BACKUP/IMAGE operation. Refer to Section 7.3.3 for restrictions on the use of wildcard characters in BACKUP commands.

When you enter a BACKUP command, BACKUP evaluates the input and output specifier and qualifiers to determine the type of operation to perform. BACKUP uses the input specifier to locate the input to the utility and directs output to the output specifier, which can be a file or a save set on disk or a save set on magnetic tape.

After executing the command, BACKUP returns to DCL command level. If you want to halt the execution of a BACKUP command prematurely, press Ctrl/Y. If BACKUP is creating a file when you press Ctrl/Y, the file is closed immediately and only partially created.

You need the user privilege TMPMBX to send messages to operator terminals when using BACKUP in batch mode. If you are performing a save operation to a volume set of sequential disks, you must have the user privilege PHY_IO or LOG_IO to write to a continuation volume. The use of several BACKUP qualifiers also requires privileges; these are noted in the appropriate qualifier descriptions.

7.5 BACKUP Qualifiers

This section describes and provides examples of each BACKUP qualifier. Make sure that you understand how the position of BACKUP qualifiers affects BACKUP operations. See Section 7.2 for information about the BACKUP command line format. Table 7-2 summarizes the BACKUP qualifiers.