Deixe-me citar esta pergunta maravilhosa com a resposta selecionada, para evitar explicar novamente algo que já foi respondido em outro site de stackexchange. Esta é a seção da bash(1)
página de manual relacionada à cotação de variável:
Enclosing characters in single quotes (
'
) preserves the literal value of each character within the quotes. A single quote may not occur between single quotes, even when preceded by a backslash.Enclosing characters in double quotes (
"
) preserves the literal value of all characters within the quotes, with the exception of$
,'
,\
, and, when history expansion is enabled,!
. The characters$
and'
retain their special meaning within double quotes (see Shell Expansions). The backslash retains its special meaning only when followed by one of the following characters:$
,'
,"
,\
, or newline. Within double quotes, backslashes that are followed by one of these characters are removed. Backslashes preceding characters without a special meaning are left unmodified. A double quote may be quoted within double quotes by preceding it with a backslash. If enabled, history expansion will be performed unless an!
appearing in double quotes is escaped using a backslash. The backslash preceding the!
is not removed.The special parameters
*
and@
have special meaning when in double quotes (see Shell Parameter Expansion).
Resposta: É por isso que no seu arquivo de destino você tinha $dev
em vez do conteúdo dessa variável.