|Using as: SH-Chars|
‘!’ is the line comment character.
You can use ‘;’ instead of a newline to separate statements.
If a ‘#’ appears as the first character of a line then the whole line is treated as a comment, but in this case the line could also be a logical line number directive (see Comments) or a preprocessor control command (see Preprocessing).
Since ‘$’ has no special meaning, you may use it in symbol names.