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chenjiancan/awk_catch_log.sh

Created August 20, 2018 09:54
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监控指定日志文件，要求从在指定时间之后的日志开始扫描，日志中出现 ‘installed memtester’ 行，打印出来
Raw
awk_catch_log.sh
# awk 支持直接比较时间字符串，并通过 ~ match表达式匹配包含字符串
awk '$1>="2018-08-17"&&$2>"09:55:20"&&$0 ~ /installed memtester/ {print $0}' /var/log/dpkg.log
# 输出是： 2018-08-17 09:55:30 status installed memtester:amd64 4.3.0-3
# 如果需要持续监控日志文件，可以使用 tail -1f 持续的输出最后一行，并通过 | pipe 交给awk 处理, exit 表示在匹配到一次后退出
tail -f /var/log/dpkg.log | awk '$1>="2018-08-17"&&$2>"09:55:20"&&$0 ~ /installed memtester/ {print $0; exit}'
# 可通过 tail -Nf （N 为行数）来指定从倒数第几行开始扫描
Raw
example.log
2018-08-11 22:48:37 status installed man-db:amd64 2.7.5-1
2018-08-11 22:48:37 startup packages configure
2018-08-11 22:48:37 configure tree:amd64 1.7.0-3 <none>
2018-08-11 22:48:37 status unpacked tree:amd64 1.7.0-3
2018-08-11 22:48:37 status half-configured tree:amd64 1.7.0-3
2018-08-11 22:48:37 status installed tree:amd64 1.7.0-3
2018-08-11 22:48:38 startup packages configure
2018-08-16 23:08:58 startup archives unpack
2018-08-16 23:09:03 install htop:amd64 <none> 2.0.1-1ubuntu1
2018-08-16 23:09:03 status half-installed htop:amd64 2.0.1-1ubuntu1
2018-08-16 23:09:03 status triggers-pending mime-support:all 3.59ubuntu1
2018-08-16 23:09:04 status triggers-pending man-db:amd64 2.7.5-1
2018-08-16 23:09:04 status unpacked htop:amd64 2.0.1-1ubuntu1
2018-08-16 23:09:04 status unpacked htop:amd64 2.0.1-1ubuntu1
2018-08-16 23:09:05 trigproc mime-support:all 3.59ubuntu1 <none>
2018-08-16 23:09:05 status half-configured mime-support:all 3.59ubuntu1
2018-08-16 23:09:05 status installed mime-support:all 3.59ubuntu1
2018-08-16 23:09:05 trigproc man-db:amd64 2.7.5-1 <none>
2018-08-16 23:09:05 status half-configured man-db:amd64 2.7.5-1
2018-08-16 23:09:18 status installed man-db:amd64 2.7.5-1
2018-08-16 23:09:19 startup packages configure
2018-08-16 23:09:19 configure htop:amd64 2.0.1-1ubuntu1 <none>
2018-08-16 23:09:19 status unpacked htop:amd64 2.0.1-1ubuntu1
2018-08-16 23:09:19 status half-configured htop:amd64 2.0.1-1ubuntu1
2018-08-16 23:09:19 status installed htop:amd64 2.0.1-1ubuntu1
2018-08-16 23:09:19 startup packages configure
2018-08-17 09:55:11 startup archives unpack
2018-08-17 09:55:14 install memtester:amd64 <none> 4.3.0-3
2018-08-17 09:55:14 status half-installed memtester:amd64 4.3.0-3
2018-08-17 09:55:15 status triggers-pending man-db:amd64 2.7.5-1
2018-08-17 09:55:15 status unpacked memtester:amd64 4.3.0-3
2018-08-17 09:55:15 status unpacked memtester:amd64 4.3.0-3
2018-08-17 09:55:16 trigproc man-db:amd64 2.7.5-1 <none>
2018-08-17 09:55:16 status half-configured man-db:amd64 2.7.5-1
2018-08-17 09:55:29 status installed man-db:amd64 2.7.5-1
2018-08-17 09:55:29 startup packages configure
2018-08-17 09:55:29 configure memtester:amd64 4.3.0-3 <none>
2018-08-17 09:55:29 status unpacked memtester:amd64 4.3.0-3
2018-08-17 09:55:29 status half-configured memtester:amd64 4.3.0-3
2018-08-17 09:55:30 status installed memtester:amd64 4.3.0-3
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