read - read a line from standard input read [-r] var... The read
utility shall read a single line from standard input. By
default, unless the -r option is specified, backslash ( '\' )
shall act as an escape character, as described in Escape
Character (Backslash). If standard input is a terminal device
and the invoking shell is interactive, read shall prompt for a
continuation line when: The shell reads an input line ending
with a backslash, unless the -r option is specified. A here-
document is not terminated after a <newline> is entered. The
line shall be split into fields as in the shell (see Field
Splitting); the first field shall be assigned to the first
variable var, the second field to the second variable var, and
so on. If there are fewer var operands specified than there are
fields, the leftover fields and their intervening separators
shall be assigned to the last var. If there are fewer fields
than vars, the remaining vars shall be set to empty strings. The
setting of variables specified by the var op