xiazhibin

cat /var/log/nginx/access.log | awk '{print $7}' | sort | uniq -c | sort -r -n |head -n 5

• uniq 去取重复的行 -c, --count prefix lines by the number of occurrences
• sort 排序 -r 以相反的顺序来排序 -n 依照数值的大小排序
• head 显示开头 -n 显示的行数

wc -l 统计行数

du * -hs | sort -hr 查看文件夹大小

cat /dev/null > test.txt 清空文件

xiazhibin

检测环境变量存不存在

if [ -z ${VAR+x} ]
then
    echo "VAR not exist"
else
    echo "$VAR"
fi

xiazhibin

location ~ \.(woff|woff2|ttf|dds|map|js|css|jpg|png|gif|lang|ico|mp4|json) {
        if ($request_uri ~* "^.*a\.js$ ") {
             add_header    Cache-Control  no-store;
        }
        root     /www-data/example1;
	    try_files $uri =404;
}

xiazhibin

#!/bin/bash

while read CMD; do
  # each command begins with *{number arguments in command}\r\n
  XS=($CMD); printf "*${#XS[@]}\r\n"
  # for each argument, we append ${length}\r\n{argument}\r\n
  for X in $CMD; do printf "\$${#X}\r\n$X\r\n"; done
done < redis_commands.txt