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HP OpenVMS DCL Dictionary
SHOW LOGICAL
Displays translations, the level of translation, and the logical name
table for a specified logical name. The SHOW LOGICAL command performs
iterative translations.
Requires read (R) access to the table in which a logical name
is cataloged to display information about the logical name.
Format
SHOW LOGICAL [logical-name[:][,...]]
Parameter
logical-name[:][,...]
Specifies one or more logical names whose translations you want to
display. The asterisk (*) and the percent sign (%) wildcard characters
are allowed; however, if a wildcard character is used, iterative
translation is not done.
The logical name is translated iteratively up to a number of times
determined by the system (from 9 to 11). That is, translations are
examined to see if they are also logical names.
Description
The SHOW LOGICAL command displays logical names.
The logical name LNM$DCL_LOGICAL contains the list of logical name
tables and the order in which they are searched. Unless LNM$DCL_LOGICAL
has been redefined, the process, job, group, and system tables are
searched, in that order. (To see how LNM$DCL_LOGICAL is defined for
your process, enter the command SHOW LOGICAL/TABLE=LNM$DIRECTORIES
LNM$DCL_LOGICAL.)
If you specify a logical name, its translations are displayed. If you
do not specify a logical name, all the logical names in the tables
defined by the logical name LNM$DCL_LOGICAL are displayed.
You can specify the tables you want to search. If you do not specify a
table, SHOW LOGICAL searches the tables specified by the logical name
LNM$DCL_LOGICAL.
The SHOW LOGICAL command performs iterative translations. If a logical
name has more than one translation, then all translations at a level
are displayed before going to the next level. Use the SHOW TRANSLATION
command to display only the first translation found for a specified
logical name.
The SHOW LOGICAL command executes an image and causes the current image
(if any) to exit. Use the SHOW TRANSLATION command (which is built into
the command interpreter) when you do not want to exit the current image.
If a logical name contains control characters, the SHOW LOGICAL command
replaces them with periods (.) for display.
Qualifiers
/ACCESS_MODE=mode
Displays names defined in the specified access mode and any inner
access modes. You can specify one of the following keywords to indicate
the access mode: USER_MODE, SUPERVISOR_MODE, EXECUTIVE_MODE, or
KERNEL_MODE.
The default value for this qualifier is USER_MODE; by default any
definitions in all four access modes are displayed.
/ALL (default)
Indicates that all logical names in the specified logical name tables
are to be displayed. If you do not enter the /PROCESS, /JOB, /GROUP,
/SYSTEM, or /TABLE qualifier, all logical names in the tables specified
by the logical name LNM$DCL_LOGICAL are displayed.
/CLUSTER
Displays all the logical names in all clusterwide tables (for example,
the LNM$CLUSTER and LNM$SYSCLUSTER tables).
/DESCENDANTS
/NODESCENDANTS (default)
Controls whether the system displays names from the specified logical
name table and any descendant tables. A descendant table is created by
the CREATE/NAME_TABLE command, with the /PARENT_TABLE qualifier
specifying its parent table. If you use the /DESCENDANTS qualifier, you
must also use the /TABLE qualifier.
/EXACT
Use with the /PAGE=SAVE and /SEARCH qualifiers to specify a search
string that must match the search string exactly and must be enclosed
with quotation marks (" ").
If you specify the /EXACT qualifier without the /SEARCH qualifier,
exact search mode is enabled when you set the search string with the
Find (E1) key.
/FULL
Displays more detailed information for the specified logical name. The
information includes the access mode, attributes, the translation, and
the logical name table.
/GROUP
Indicates that only the group logical name table is to be searched. The
/GROUP qualifier is synonymous with the /TABLE=LNM$GROUP qualifier. If
you specify the /GROUP qualifier and you do not also specify a logical
name, all names in the group table are displayed.
/HIGHLIGHT[=keyword]
Use with the /PAGE=SAVE and /SEARCH qualifiers to specify the type of
highlighting you want when a search string is found. When a string is
found, the entire line is highlighted. You can use the following
keywords: BOLD, BLINK, REVERSE, and UNDERLINE. BOLD is the default
highlighting.
/JOB
Indicates that only the job logical name table is to be searched. The
/JOB qualifier is synonymous with the /TABLE=LNM$JOB qualifier. If you
specify the /JOB qualifier and you do not also specify a logical name,
all names in the job logical name table are displayed.
/OUTPUT[=filespec]
/NOOUTPUT
Controls where the output of the SHOW LOGICAL command is sent. By
default, the output of the SHOW LOGICAL command is sent to the current
SYS$OUTPUT device (usually your terminal). To send the output to a
file, use the /OUTPUT qualifier followed by a file specification.
The asterisk (*) and the percent sign (%) wildcard characters are not
allowed in the file specification. If you enter a partial file
specification (for example, specifying only a directory), SHOW is the
default file name and .LIS is the default file type.
If you enter the /NOOUTPUT qualifier, output is suppressed.
/PAGE[=keyword]
/NOPAGE (default)
Controls the display of information on the screen.
You can use the following keywords with the /PAGE qualifier:
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CLEAR_SCREEN
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Clears the screen before each page is displayed.
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SCROLL
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Displays information one line at a time.
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SAVE[=
n]
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Enables screen navigation of information, where
n is the number of pages to store.
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The /PAGE=SAVE qualifier allows you to navigate through screens of
information. The /PAGE=SAVE qualifier stores up to 5 screens of up to
255 columns of information. When you use the /PAGE=SAVE qualifier, you
can use the following keys to navigate through the information:
| Key Sequence |
Description |
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Up arrow key, Ctrl/B
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Scroll up one line.
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Down arrow key
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Scroll down one line.
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Left arrow key
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Scroll left one column.
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Right arrow key
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Scroll right one column.
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Find (E1)
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Specify a string to find when the information is displayed.
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Insert Here (E2)
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Scroll right one half screen.
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Remove (E3)
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Scroll left one half screen.
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Select (E4)
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Toggle 80/132 column mode.
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Prev Screen (E5)
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Get the previous page of information.
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Next Screen (E6), Return, Enter, Space
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Get the next page of information.
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F10, Ctrl/Z
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Exit. (Some utilities define these differently.)
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Help (F15)
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Display utility help text.
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Do (F16)
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Toggle the display to oldest/newest page.
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Ctrl/W
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Refresh the display.
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The /PAGE qualifier is not compatible with the /OUTPUT qualifier.
/PROCESS
Indicates that only the process logical name table is to be searched.
The /PROCESS qualifier is synonymous with the /TABLE=LNM$PROCESS
qualifier. If you specify the /PROCESS qualifier and you do not also
specify a logical name, all names in the process table are displayed.
/SEARCH="string"
Use with the /PAGE=SAVE qualifier to specify a string that you want to
find in the information being displayed. Quotation marks are required
for the /SEARCH qualifier, if you include spaces in the text string.
You can also dynamically change the search string by pressing the Find
key (E1) while the information is being displayed. Quotation marks are
not required for a dynamic search.
/STRUCTURE
/NOSTRUCTURE (default)
Controls whether the system displays the "family tree" of all
accessible logical name tables. The display includes the two logical
name directory tables (process and system) and all logical name tables
cataloged in these directory tables. Any descendant logical name tables
are shown under their parent tables.
If you specify the /STRUCTURE qualifier, you cannot use any other
qualifiers except /ACCESS_MODE, /FULL, and /OUTPUT.
/SYSTEM
Indicates that only the system logical name table is to be searched.
The /SYSTEM qualifier is synonymous with the /TABLE=LNM$SYSTEM
qualifier. If you specify the /SYSTEM qualifier and you do not also
specify a logical name, all names in the system table are displayed.
/TABLE=(name[,...])
Specifies the tables you want to search. If you specify only one table,
you can omit the parentheses. The asterisk (*) and the percent sign (%)
wildcard characters are allowed. Names with wildcards are used to match
table names. Names without wildcard characters are treated both as
table names and table search lists (whichever is appropriate).
You can use the /TABLE qualifier to specify the following:
- A user-defined logical name table (created with the
CREATE/NAME_TABLE command)
- The process, group, or system logical name tables
- The process or system directory tables
If you specify the table name by using a logical name that translates
to more than one table, then each table is searched in the order
specified. For example, if you specify SHOW LOGICAL/TABLE=LNM$FILE_DEV,
and LNM$FILE_DEV is equated to LNM$PROCESS, LNM$JOB, LNM$GROUP, and
LNM$SYSTEM, then the process, job, group, and system tables are
searched, in that order.
If you do not specify the /TABLE qualifier, the default is
/TABLE=LNM$DCL_LOGICAL.
/WRAP
/NOWRAP (default)
Use with the /PAGE=SAVE qualifier to limit the number of columns to the
width of the screen and to wrap lines that extend beyond the width of
the screen to the next line.
The /NOWRAP qualifier extends lines beyond the width of the screen and
can be seen when you use the scrolling (left and right) features
provided by the /PAGE=SAVE qualifier.
Examples
| #1 |
$ SHOW LOGICAL/PROCESS
(LNM$PROCESS_TABLE)
"SYS$COMMAND" = "_TTB4:"
"SYS$DISK" = "WORK6:"
"SYS$DISK" = "WORK6:"
"SYS$ERROR" = "_TTB4:"
"SYS$INPUT" = "_TTB4:"
"SYS$LOGIN" = "WORK6:[ODONNELL]"
"SYS$LOGIN_DEVICE" = "WORK6:"
"SYS$OUTPUT" = "_TTB4:"
"SYS$OUTPUT" = "DKA2:"
"SYS$SCRATCH" = "WORK6:[ODONNELL]"
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The SHOW LOGICAL command in this example displays all process logical
names and their translations. (Note that /TABLE=LNM$PROCESS would
produce the same display as /PROCESS.)
| #2 |
$ SHOW LOGICAL INFILE
"INFILE" = "WORK6:[LOGAN]PAYROLL.EXE" (LNM$PROCESS_TABLE)
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The SHOW LOGICAL command in this example displays the translation for
the logical name INFILE. The response indicates that the logical name
was found in the process logical name table.
| #3 |
$ SHOW LOGICAL/GROUP
.
.
.
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The SHOW LOGICAL command in this example displays all group logical
names and their translations. (Note that /TABLE=LNM$GROUP would produce
the same display as /GROUP.)
| #4 |
$ SHOW LOGICAL/TABLE=SYSTEM SYS$LIBRARY
"SYS$LIBRARY" = "SYS$SYSROOT:[SYSLIB]" (LNM$SYSTEM_TABLE)
= "DOCD$:[SYSC.SYSLIB]"
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The SHOW LOGICAL command in this example displays the translation of
the logical name SYS$LIBRARY in the system table. The response
indicates that SYS$LIBRARY is defined in the system table, and that the
logical name has two translations.
| #5 |
$ SHOW LOGICAL/TABLE=LNM$GROUP/TABLE=LNM$SYSTEM SYS$DISK
"SYS$DISK" = "ZZZ3:" (LNM$SYSTEM_TABLE)
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The SHOW LOGICAL command in this example is qualified by both the
/TABLE=LNM$GROUP and /TABLE=LNM$SYSTEM qualifiers. The response
indicates that the logical name SYS$DISK was found in the system
logical name table. When you enter two conflicting qualifiers, as in
this example, only the last qualifier you specify is used.
| #6 |
$ SHOW LOGICAL/TABLE=LNM$PROCESS_DIRECTORY
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The SHOW LOGICAL command in this example displays the logical names in
the process directory table. Each name is either a table name, or a
name that translates iteratively to a table.
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