关于变量赋值的问题

wawxdyy

export $PATHVARIABLE="${!PATHVARIABLE:+${!PATHVARIABLE}:}$1"
请问其中的!是什么意思呢,谢谢

yongjian

you had an error. The variable name right after export should not have the $ sign. For the meaning of !, pls look at ABS on indirect reference. (or indirect substitution)