awk指定[]为分隔符

root@standby[16:38:35]$ 
root@standby[16:38:35]$ cat tmp.log 
qq [8.8.8.8] 6.6.6.6 [1502301436.016] "GET / HTTP/1.1" 200 21 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" "-" "0.059"
qq [9.9.9.9] 6.6.6.6 [1502387868.069] "GET / HTTP/1.1" 200 21 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" "-" "0.059"
qq [2.2.2.2] 6.6.6.6 [1502474196.260] "GET / HTTP/1.1" 200 21 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" "-" "0.059"
root@standby[16:38:41]$ 
root@standby[16:38:42]$ awk -F "[][]" '{print $2"	"$3"	"$4}' tmp.log 
8.8.8.8	 6.6.6.6 	1502301436.016
9.9.9.9	 6.6.6.6 	1502387868.069
2.2.2.2	 6.6.6.6 	1502474196.260
root@standby[16:38:43]$