Oleg:
в том котором вы и смотрели , man bash . Вы читали подраздел qouting. Т.е. применение бэкслеша там обсуждается в этом контексте : echo "\"" .
А то что бэкслеш отменяет алиасинг в командной оболочке к "сохранение буквального значения одного символа" отношения не имеет.
QUOTING
Quoting is used to remove the special meaning of certain characters or
words to the shell. Quoting can be used to disable special treatment
for special characters, to prevent reserved words from being recognized
as such, and to prevent parameter expansion.
Each of the metacharacters listed above under DEFINITIONS has special
meaning to the shell and must be quoted if it is to represent itself.
When the command history expansion facilities are being used (see HIS‐
TORY EXPANSION below), the history expansion character, usually !, must
be quoted to prevent history expansion.
There are three quoting mechanisms: the escape character, single
quotes, and double quotes.
A non-quoted backslash (\) is the escape character. It preserves the
literal value of the next character that follows, with the exception of
. If a \ pair appears, and the backslash is not
itself quoted, the \ is treated as a line continuation (that
is, it is removed from the input stream and effectively ignored).
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