HP 3000 Manuals HP 3000 Manuals
REDO
Edits and executes a command in the command history buffer.
Syntax
[m ]
RED[O] [-n ]
[string]
Parameters
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
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.
Subcommands
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
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
.
.
.
edited LIST command is executed
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
.
.
.
edited FIND command is executed