Linux命名cat grep查看日志

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以前公司看日志是直接down下来，一点点看，现在的日志文件，大的很，几个g，根本不能这样，

不过日志吗，都是有规律的，使用cat等查看文本的数据，

cat、more、less、tail、head.

说一下用这个cat指令，

cat data_receiver.log.2016-03-04 | grep "\"lineName\":\"212路\"" | grep "\"direction\":\"0\"" | grep 16:02

单独cat data_receiver.log.2016-03-04，从头到尾把文件的所有内存都列举出来，然后使用grep管道一步步过滤，

首先获得包含 "lineName":"21路"，引号复用，需要\ 转义，然后获得 "direction":"0" ，

不过最后 | grep 时间，数据的格式，但是时间在他之前，不过这样的命名也对：

cat data_receiver.log.2016-03-04 | grep 20:46 | grep "\"lineName\":\"21路\"" | grep "\"direction\":\"0\"" 。这就是grep这个管道命令的厉害，

应该的定位到一行，然后这行里面进行筛选，就是这样，其实就是这么简单，没有什么难的。

grep对数据是按行进行过滤，所以过滤不用分先后，先过滤哪个就行。强大的命令啊。

[test@TB2 logs]$cat data_receiver.log.2016-03-04 | grep "\"lineName\":\"21路\"" | grep "\"direction\":\"0\"" | grep 20:46
2016-03-04 20:46:16 [INFO] data_receiver_log - REQ_COST=246 TRANS_COST=76 CRAWL RET: {"responseTime":1457095576281,"status":"00","requestTime":1457095576035,"siteId":"xz_zsgjapp","cityId":"057","lineName":"21路","lineNo":"21路","direction":"0","stopOrder":-1,"stopName":"","type":1,"priority":100,"crawledData":"[]","persist":1,"ignoreCache":0}
2016-03-04 20:46:45 [INFO] data_receiver_log - REQ_COST=105 TRANS_COST=85 CRAWL RET: {"responseTime":1457095605822,"status":"00","requestTime":1457095605717,"siteId":"xz_zsgjapp","cityId":"057","lineName":"21路","lineNo":"21路","direction":"0","stopOrder":-1,"stopName":"","type":1,"priority":100,"crawledData":"[]","persist":1,"ignoreCache":0}

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