有关字符串查找shell命令

1、从test.sh中查找root@localhost:的行并赋值给aa

aa=$(sed -n '/root@localhost:/p' test.sh)

echo $aa

s generated for root@localhost:YbitKorHK3<T

2、echo ${aa#*:}

删除: 号及左边的所有字符

bb=$(echo ${aa#*:})

echo $bb

YbitKorHK3<T