Linux环境下，请用一条命令计算出request.log文件中所有包含“requestDate”但是不包含“error”的行数

root@ubuntu:/duoceshi# grep  "requestDate" *.log|grep -v "error" *.log
requestDate
requestDate
requestDate
hello
root@ubuntu:/duoceshi# grep  "requestDate" *.log|grep -v "error" *.log|wc -l
4
root@ubuntu:/duoceshi# grep "requestDate" *.log|grep -v "error" *.log|wc -l
4
root@ubuntu:/duoceshi# 
root@ubuntu:/duoceshi# 
root@ubuntu:/duoceshi# ll
total 17044
drwxr-xr-x  3 root    root        4096 Sep 26 01:00 ./
drwxr-xr-x 25 root    root        4096 Sep 23 20:18 ../
drwxr-xr-x 17 xiaoshu xiaoshu     4096 Sep 23 20:19 Python-2.7.16/
-rw-r--r--  1 root    root    17431748 Mar  2  2019 Python-2.7.16.tgz
-rw-r--r--  1 root    root         111 Sep 26 00:59 request.log
root@ubuntu:/duoceshi# 
root@ubuntu:/duoceshi# cat request.log 
requestDate hello error
requestDate
requestDate
requestDate
requestDaterequestDateerror
errorrequestDate
hello