标题：[实践OK]统计redis中某类key的数量，代替keys指令
出处：向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
时间：Sat, 29 Dec 2018 15:44:37 +0000
作者：jackxiang
地址：https://jackxiang.com/post/10011/

内容：

SCAN 0 MATCH SESS_* COUNT 10
redis-cli -p 6401 -a X**--scan --pattern "SESS*"  > /tmp/10.71.1*.3*_SESS_KEYS_ALL.txt



#!/bin/bash

A=$0
B=${A##*/}
C=${B%.*}
running_file_name=$C
running_flag="run.$running_file_name"

REDIS_CLIENT='redis-cli -h 0.0.0.0 -p 6400 -x'
function process {
    echo $0
    index=-1
    count=0
    step=100000
    while ((index!=0))
    do
      if [ $index -le 0 ];then
        index=0
      fi
      echo "scan $index match $1 count $step" | $REDIS_CLIENT > $running_file_name.cache
      read index <<< `head -1 $running_file_name.cache`
      read inc <<< `cat $running_file_name.cache | wc -l`
      inc=$((inc - 1))
      if [ $? -ne 0 ];then
        break
      fi
      count=$((count + inc))
    done
    echo "$1 count:"$count
}
#
if [ $# -ne 1 ];then
    echo "$0 <pars>"
    exit 0
fi
#
if [ -f "$running_flag" ] ; then
    echo "is running..."
    exit 0
fi
#
touch $running_flag
#
echo "processing...."
echo $*
process $*
#
rm -rf $running_flag
#
echo "ok!"



./redis_keycount.sh 'SESS*'   
processing....
SESS*
./redis_keycount.sh



SESS* count:21798578
ok!

来自：https://studygolang.com/articles/14275?fr=sidebar


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