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Edits and executes a command in the command history buffer.
Syntax
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Parameters
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- m
displays the command that has this absolute number.
Absolute numbers are positive numbers beginning with the first
(least recent) command in the command history buffer.
For example, 1 is the first command in the buffer.
(This is the number displayed by the LISTREDO command with
the ABS option or with the default of absolute numbering.)
- -n
displays the command that has this relative number.
Relative numbers are negative numbers beginning with the
last (most recent) command in the command history buffer.
For example, -1 is the last command in the buffer.
(This is the number displayed by the LISTREDO command with
the REL option.) -n must be from -1 to -20.
- string
displays the most recent command that begins with the
specified string. The string can only contain alphanumeric
characters. It cannot contain blanks or special characters
such as ; , ( ) = .
Discussion
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When the REDO command is issued, you are placed into an "edit mode"
to modify the specified command. The subcommands discussed next
can then be used to change the displayed command. You type the
subcommands on the line below the line you are currently editing.
You can type the subcommands in either upper or lowercase
characters. Any characters other than the subcommands are
interpreted as replacement characters.
The REDO command is not recorded in the command history buffer.
In addition, the REDO command cannot be used in a command file.
The command history buffer contains the last 20 commands issued
during the current QUERY session.
You can use the LISTREDO command to display the
contents of the command history buffer with the number of
each command.
Parameters
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- B or S
breaks the current line by moving the character above the B (or S)
and all subsequent characters on the line to the next line.
The second half of the line becomes the current line.
- D
deletes the character above the D. You can delete multiple
characters by typing a D below the first character to be
deleted and another D below the last character to be deleted.
You can also type D's consecutively under each character
to be deleted. The D subcommand can be followed by the I
subcommand.
- H
lists all the valid editing subcommands, then redisplays the
line you are currently editing.
- I
inserts one or more characters preceding the character above
the I. Type I followed by the characters to be inserted.
- L
displays the complete command in its current state, then redisplays
the line you are currently editing.
- R
replaces one or more characters beginning with the character above
the R. Type R followed by the replacement characters.
- U
undoes any changes to the current command and executes the
original command. Type U anywhere under the current line.
- X
executes the edited version of the command. You can type X
at any time.
- +[n]
displays the nth line forward in the current command for
editing. By default, n is 1. Therefore, + and +1 have
the same effect.
- -[n]
displays the nth line backward in the current command for
editing. By default, n is 1. Therefore, - and -1 have
the same effect.
- RETURN
displays the next line for editing. If the current line is the
last line, the edited command is executed.
The ampersand (&) continuation character is not used to continue
a command that is being edited.
Examples
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Example 1
In the example below, the LISTREDO command is first used to display
the number of the command to be edited. The REDO command is issued
with the number previously displayed by the LISTREDO command.
Next, the subcommands are used to edit and execute the command.
>LISTREDO -3
47) DEFINE
48) LIST LAST-NAME, STREET-ADDRESS, CITY, STATE FOR CUSTOMER.LAST-NAME
IB A,N AND STATE <> "NEW YORK" OR ACCOUNT GT 55555555
49) LISTREDO
>REDO 48
LIST LAST-NAME, STREET-ADDRESS, CITY, STATE FOR CUSTOMER.LAST-NAME
D D
LIST LAST-NAME, STREET-ADDRESS, CITY FOR CUSTOMER.LAST-NAME
RETURN
IB A,N AND STATE <> "NEW YORK" OR ACCOUNT GT 55555555
R66666666
IB A,N AND STATE <> "NEW YORK" OR ACCOUNT GT 66666666
X
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.
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edited LIST command is executed
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Example 2
In the next example, the string parameter is used to specify
the command to be edited. First, five commands in the buffer are
displayed with the LISTREDO command. When the REDO command is executed,
the most recent command that begins with FIND is displayed.
>LISTREDO ,5
1) DEFINE
2) FIND ALL CUSTOMER.ACCOUNT
3) MULTIDB
4) FIND PROCF5
5) LISTREDO ,5
>REDO FIND
FIND PROCF5
I2
FIND PROCF25
RETURN
.
.
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edited FIND command is executed
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