$
due to have they are read
in shell, using the command echo $VARIABLE.
a-z
.
-
) or exactly one
plus sign (+
), and have exactly one character beyond that. They may be argumentless,
argumented, optionally argumented, or variadic (consumes all following arguments).
-
) or at least two
plus signs (+
), beyond that they have at least one character, but often at least one
work. They by be argumentless, argumented, optionally argumented, or variadic (consumes all
following arguments).
m
. This is extended to 256 colours, from 16 colours, by
xterm which is de facto standardise.
[
, used in standardised ANSI escape sequences.
]
, used in non-standardised ANSI escape
sequences.