[英]how to double pipe candump
when using candump to read can bus : 使用candump读取can bus时:
$ candump can0
if I grep it once : 如果我一次grep:
$ candump can0 | grep <whatever>
It works perfectly : 它完美地工作:
$ candump can0 | grep 1A8
can0 1A8 [8] 3C 53 C5 FF 0D C3 3A 01
can0 1A8 [8] 3C 53 C5 FF 0D C3 3A 01
If I try to grep it twice : 如果我尝试两次grep:
candump can0 | grep 1A8 | grep 1A8
it returns nothing ... 它什么也没返回...
Ps : it might be solved by using this ( candump can0,<whatever>,7ff | grep <whatever>
but it only works in that precise case ) ps:可能可以通过使用它来解决(
candump can0,<whatever>,7ff | grep <whatever>
但仅在这种情况下有效)
Edit: for clarity, if I grep twice the same things it's still not working 编辑:为清楚起见,如果我两次重复同样的事情,它仍然无法正常工作
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