更新log_history_rm_x_days.sh

log_history_rm_x_days.sh

 #!/bin/bash
 starttime=`date +'%Y-%m-%d %H:%M:%S'`
 logdir=$1
-days=$2
+days=-$2
 
 old_day=`date +%Y-%m-%d -d"$days days"`
 filename=$logdir/*$old_day*