1a='abc' 2r=${a//b/\041#} 3echo $r 4echo ${a//b/\041#} 5echo "${a//b/\041#}" 6 7a='abc' 8r=${a//b/\\041#} 9echo $r 10echo ${a//b/\\041#} 11echo "${a//b/\\041#}" 12 13a='abc' 14b='\041#' 15r=${a//b/$b} 16echo $r 17echo ${a//b/$b} 18echo "${a//b/$b}" 19 20a='abc' 21b='\' 22r="${a//b/$b}" 23echo $r 24echo ${a//b/$b} 25echo "${a//b/$b}" 26 27a='abc' 28b='\\' 29r="${a//b/$b}" 30echo $r 31echo ${a//b/$b} 32echo "${a//b/$b}" 33 34a='abc' 35b='\t' 36r="${a//b/$b}" 37echo $r 38echo ${a//b/$b} 39echo "${a//b/$b}" 40echo ${a//b/\t} 41echo "${a//b/\t}" 42