Shell scripts can quickly obtain a parameter in the access log.

For example, if we count Sid, the access log is as follows:

203.142.196.181--[07/Jan/2009: 06: 02: 58 + 0900] "Get/AD/queryphp. jsp? V = 1.5 & Ct = i02 & TOS = A & Key = % 3f % 3f % 3f & SID = 100575311 & ENC = sjis HTTP/1.0 "200 944"-"" {KDDI-SN3B up. browser/6.2.0.13.1.5 (GUI) MMP/2.0} "113185 1177

You can only use awk to complete the process. First, split by "SID =", take the second column, and then split by "&". Then, take the first column and OK.

Awk-F "SID =" '{print $2}' test | awk-F "&" '{print $1 }'

Another method is to use echo to remove the head and tail.

A = $ (echo string); # source string

B = $ (echo "$ {A # * SID =}") # extract the data after the SID.

Echo "$ {B % & *}" # tail and remove all & S

So powerful !!!!!