Re: Questions about: ! and . and lower case and upper case

On 09/04/11 05:01, Rostyslaw Lewyckyj wrote:
> 1) Does ! have a single general meaning, when it is added
> to a command? i.e. Can one make any prediction as to where
> a ! may show up and how it may change the behaviour of
> the base command?

For a command which writes to disk, adding ! usually forces a write. For
a command which unloads a buffer, ! usually forces changes to be lost if
there are any and 'autowrite' and 'autowriteall' are not set. There are
others. In general: check the help and it will tell you.

> 2) Where and when is . needed as a concatenation operator?

In an expression. Not in the operands of :echo and friends if you want
successive expressions to be separated by a single space. IOW,

:echo 'foo' 'bar' 'baz'
or
:echo 'foo' . ' ' . 'bar' . ' ' . 'baz'
or
:echo 'foo bar baz'

all display the same text.

> 3) Are there any rules about the relationship of lower case
> commands and upper case commands, such as: i vs I, d vs D,
> visual vs Visual, etc.

They often have a relationship, but not always and not one that could be
taught to a machine by one simple rule. Similarly Ctrl-letter and g
followed by letter. Here also, when in doubt, look up the help.

Examples:

o open after
O open before
^O move back in jump list
go go to byte

p put after
P put before
^P up (same as k)
gp put after, leave cursor after new text
gP put before, leave cursor after new text

v start characterwise visual
V start linewise visual
^V start blockwise visual
gv repeat previous visual

gh start characterwise Select
gH start linewise Select
g^H start blockwise Select
h left
H top of window
^H backspace

i insert before cursor
I insert before all lines of block-visual highlight
^I tab
gi insert text at same position as when Insert was last left
gI insert text in column 1

a append after cursor
A append after all lines of block-visual highlight
^A increment
ga display ascii value

j go down
J join lines adding spaces
gJ join lines adding no spaces
^J same as j

q start/stop recording
Q start Ex mode
^Q start block-visual (same as ^V)

r replace one (or [count]) characters
R start Replace mode
^R redo
gr virtual replace one (or [count]) characters
gR start virtual replace

d delete (followed by motion if not in Visual)
dd delete line
D delete to EOL (same as d$ )
^D scroll downwards
gd go to local declaration
gD go to global declaration

c change (+ motion if not in Visual)
cc change line
C change to EOL (same as c$ )
^C interrupt

etc.

Best regards,
Tony.
--
... But the reward of a successful collaboration is a thing that cannot
be produced by either of the parties working alone. It is akin to the
benefits of sex with a partner, as opposed to masturbation. The latter
is fun, but you show me anyone who has gotten a baby from playing with
him or herself, and I'll show you an ugly baby, with just a whole bunch
of knuckles.
-- Harlan Ellison

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