java字符串拼接换行 shell处理字符串拼接？
shell处理字符串拼接？[根@localhost~]#a=123您在/var/spool/mail/root[根@localhost~]#b=456[根@localhost~]#回声$a$b1234
shell处理字符串拼接？
[根@localhost~]#a=123您在/var/spool/mail/root[根@localhost~]#b=456[根@localhost~]#回声$a$b123456[根@localhost~]#c=$a$b[根@localhost~]#回音$123456