A bash script that scans Redis keys by pattern using SCAN

redis-scan.sh

#!/usr/bin/env bash
# redis-scan.sh
#
# Adapted by @obscurerichard from itamarhaber/scan_del.sh:
#     https://gist.github.com/itamarhaber/11126830
#
# Thanks @czerasz and @tenlee2012 for fixes
#
# Usage:
#      ./redis-scan.sh localhost 6378 0 '*test*'
#
# NOTE: if your redis-cli supports '--scan' use that instead, thanks @ferico
#
#     redis-cli --scan --pattern '*'
#

if [ "$#" -lt 2 ]
then
  echo "Scan keys in Redis matching a pattern using SCAN (safe version of KEYS)"
  echo "Usage: $0 <host> [port] [database] [pattern]"
  exit 1
fi
host=${1:-}
port=${2:-6379}
database=${3:-0}
pattern=${4:-\*}
cursor=-1
keys=""

echo "host=${host},port=${port},database=${database}"
while [[ "$cursor" -ne 0 ]]; do
  if [[ "$cursor" -eq -1 ]]
  then
    cursor=0
  fi

  reply=$(redis-cli -h "$host" -p "$port" -n "$database" SCAN "$cursor" MATCH "$pattern")
  cursor=$(expr "$reply" : '\([0-9]*[0-9 ]\)')
  keys=${reply//$cursor/}
  if [ -n "$keys" ]; then
    echo "$keys"
  fi
done

Small fix which worked for me:

host=${1:-}
port=${2:-6379} # This line was changed
database=${3:-0}
pattern=${4:-\*} # This line was changed

what about redis-cli --scan --pattern '*'?

@farico much better! And easier 👍

#!/bin/bash

if [ "$#" -lt 2 ]
then
  echo "Scan keys in Redis matching a pattern using SCAN (safe version of KEYS)"
  echo "Usage: $0 <host> [port] [database] [pattern]"
  exit 1
fi
host=${1:-}
port=${2:-6379}
database=${3:-0}
pattern=${4:-\*}
cursor=-1
keys=""

echo "host=${host},port=${port},database=${database}"
while [[ "$cursor" -ne 0 ]]; do
  if [[ "$cursor" -eq -1 ]]
  then
    cursor=0
  fi

  reply=$(redis-cli -h "$host" -p "$port" -n "$database" SCAN "$cursor" MATCH "$pattern")
  cursor=$(expr "$reply" : '\([0-9]*[0-9 ]\)')
  #keys=${reply##[0-9]*[0-9 ]}
  keys=${reply//$cursor/}
  if [ -n "$keys" ]; then
    echo $keys
  fi
  #echo $keys
done

use

./redis-scan.sh localhost 6378 0 *test*

Tried many modifications and it seems only scan is working and delete is not properly executed. After rescan the keys still existing

Tried many modifications and it seems only scan is working and delete is not properly executed. After rescan the keys still existing

redis-cli -h xxxxxx -a 'xxxxxx' -n 0 -p 6379 --scan --pattern 'xxxxxx*' | xargs -L 2000 redis-cli -h xxxxxx -a 'xxxxxx' -n 0 -p 6379 del