随笔-常用命令-零散

【A1】某一时间点开始执行某一命令

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xdate="$(date +%F) 16:05:00";sleep $(( $(date -d "$xdate" +%s) - $(date +%s) )) && echo "666"

【A2】日志分析 对于有日志分割 使用 tail -F

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tail命令 对于有进行日志分割的使用-F替代-f，详细说明见 tail --help

【A3】日志分析

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统计请求时间分布: egrep --no-filename '^2023-10-09 17:2[3-4].*_WsServerCallBack.*Sending message' $(ls -rt cs*log | tail -n 500) -A 3 | grep forwardMsg -B 2 | egrep '^2023' | cut -c12-19 | awk '{x[$1]++;} END{for(i in x) print(i ":" x[i])}' | sort

> echo "2023-10-09 17:24:07.857568" | cut -c12-19 => 17:24:07

【A4】日志分析

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# 使用 bash mlog-save.sh "2023-10-10 09:00:00"

[ "$1" != "" ] && {
    dir_name="mlog_${1}"
    dir_name=${dir_name/ /-}
    mkdir $dir_name

    echo "FILTER LOGS..."
    log_start=$(egrep -l "^$1" $(ls -rt cs*log | tail -n 500) | head -n 1)
    [ "$log_start" != "" ] && {

        echo "FILTER LOGS SUCCESS, SAVE LOG"
        cp -a $(ls -rt cs*log | egrep -w "^${log_start}$" -A 500) $dir_name/

        cd $dir_name || exit

        log_list=$(ls -rt cs*log)
        echo "$log_list" > log-list.txt

        echo -e "$dir_name:\n$log_list\n"

        [ "$log_list" != "" ] && {
            first_line=$(egrep -nr -m 1 "^$1" $log_list | head -n 1)
            [ "$first_line" != "" ] && {
                first_line_file_name=$(awk -F':' '{print $1}' <<< "$first_line")
                first_line_start_num=$(awk -F':' '{print $2}' <<< "$first_line")

                [ "$first_line_file_name" != "" ] && {
                    [ $first_line_start_num -gt 1 ] && {
                        echo "trim log: sed -i \"1,${first_line_start_num}d\" $first_line_file_name"
                        sed -i "1,${first_line_start_num}d" $first_line_file_name
                    }
                }

                echo "数据统计:"
                # ...
            }
        }
    }
}

【】scp到服务器时即使服务器关闭了DNS还是需要等待较久才会跳出输入密码的提示

alias pwscp='scp -o PreferredAuthentications=password'

【】awk 列求和

gawk '{if (arr[$4]) {arr[$4]=arr[$4]+strtonum($2);} else {arr[$4]=strtonum($2);}}END{for(idx in arr){print idx " " arr[idx]}}' not_free.log | sort -k 2 -nr

【】sort命令详解

https://www.cnblogs.com/51linux/archive/2012/05/23/2515299.html