shell统计日志行数
统计日志行数：
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1. wc -l nginx_access.log.2011-09-26
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2. awk 'END{print NR}' nginx_access.log.2011-09-26
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3. awk '{max=max>NR?max:NR}END{print max}' nginx_access.log.2011-09-26
查看每小时的请求访问次数，脚本如下：
for i in 2011-09-24 2011-09-25 2011-09-26; do echo $i; cat /opt/work/log/nginx_access.log.$i | awk '{print $1}' | awk -F ':' '{print $2}' | sort | uniq -c; done;?