1var=abc123dcba123 2 3echo ${var/d/x} 4echo ${var/c/x} 5echo ${var//c/x} 6echo ${var/[123]/x} 7echo ${var//[123]/x} 8echo ${var/c*/x} 9echo ${var/*c/x} 10 11# must match longest match: result is "abx23" 12echo ${var/c*1/x} 13 14# empty replacement - 2nd slash can be omitted 15echo ${var/[123]} 16echo ${var//[123]} 17 18### ash doesn't support 19### # match only at the beginning: 20### echo ${var/#a/x} 21### echo ${var/#b/x} # should not match 22### echo ${var//#b/x} # should not match 23### # match only at the end: 24### echo ${var/%3/x} 25