sed 过滤时间段日志：
sed -n '/日志开始时间/,/日志结束时间/p' yum.log
注意：这个开始时间，和结束时间必须在日志中能够精确记录找到的。
如果写的是模糊的时间，sed 就会截取开始时间到源日志末尾，的所有日志。
例如：
(PRD)[root@centos7 log]#cat yum.log
May 18 04:07:39 Installed: 1:perl-parent-0.225-244.el7.noarch
May 18 04:07:39 Installed: perl-HTTP-Tiny-0.033-3.el7.noarch
May 18 04:07:39 Installed: perl-podlators-2.5.1-3.el7.noarch
May 18 04:07:39 Installed: perl-Pod-Perldoc-3.20-4.el7.noarch
May 18 04:07:39 Installed: 1:perl-Pod-Escapes-1.04-294.el7_6.noarch
May 18 04:07:40 Installed: perl-Encode-2.51-7.el7.x86_64
May 18 04:07:40 Installed: perl-Text-ParseWords-3.29-4.el7.noarch
May 18 04:07:40 Installed: perl-Pod-Usage-1.63-3.el7.noarch
May 18 04:07:40 Installed: 4:perl-libs-5.16.3-294.el7_6.x86_64
May 18 04:07:40 Installed: 4:perl-macros-5.16.3-294.el7_6.x86_64
May 18 04:07:40 Installed: perl-Storable-2.45-3.el7.x86_64
May 18 04:07:40 Installed: perl-Exporter-5.68-3.el7.noarch
May 18 04:07:40 Installed: perl-constant-1.27-2.el7.noarch
May 18 04:07:40 Installed: perl-Time-Local-1.2300-2.el7.noarch
May 18 04:07:40 Installed: perl-Socket-2.010-4.el7.x86_64
May 18 04:07:40 Installed: perl-Carp-1.26-244.el7.noarch
May 18 04:07:40 Installed: 4:perl-Time-HiRes-1.9725-3.el7.x86_64
May 18 04:07:40 Installed: perl-PathTools-3.40-5.el7.x86_64
May 18 04:07:40 Installed: perl-Scalar-List-Utils-1.27-248.el7.x86_64
May 18 04:07:40 Installed: 1:perl-Pod-Simple-3.28-4.el7.noarch
May 18 04:07:40 Installed: perl-File-Temp-0.23.01-3.el7.noarch
May 18 04:07:40 Installed: perl-File-Path-2.09-2.el7.noarch
May 18 04:07:40 Installed: perl-threads-shared-1.43-6.el7.x86_64
May 18 04:07:40 Installed: perl-threads-1.87-4.el7.x86_64
May 18 04:07:41 Installed: perl-Filter-1.49-3.el7.x86_64
May 18 04:07:41 Installed: perl-Getopt-Long-2.40-3.el7.noarch
May 18 04:07:43 Installed: 4:perl-5.16.3-294.el7_6.x86_64
May 18 04:07:43 Installed: 2:vim-filesystem-7.4.160-5.el7.x86_64
May 18 04:07:46 Installed: 2:vim-common-7.4.160-5.el7.x86_64
May 18 04:07:46 Installed: gpm-libs-1.20.7-5.el7.x86_64
May 18 04:07:46 Installed: 2:vim-enhanced-7.4.160-5.el7.x86_64
(PRD)[root@centos7 log]#
(PRD)[root@centos7 log]#sed -n '/04:07:39/,/04:07:42/p' yum.log #42秒这个时间在原日志是找不到这个时间记录的。
May 18 04:07:39 Installed: 1:perl-parent-0.225-244.el7.noarch
May 18 04:07:39 Installed: perl-HTTP-Tiny-0.033-3.el7.noarch
May 18 04:07:39 Installed: perl-podlators-2.5.1-3.el7.noarch
May 18 04:07:39 Installed: perl-Pod-Perldoc-3.20-4.el7.noarch
May 18 04:07:39 Installed: 1:perl-Pod-Escapes-1.04-294.el7_6.noarch
May 18 04:07:40 Installed: perl-Encode-2.51-7.el7.x86_64
May 18 04:07:40 Installed: perl-Text-ParseWords-3.29-4.el7.noarch
May 18 04:07:40 Installed: perl-Pod-Usage-1.63-3.el7.noarch
May 18 04:07:40 Installed: 4:perl-libs-5.16.3-294.el7_6.x86_64
May 18 04:07:40 Installed: 4:perl-macros-5.16.3-294.el7_6.x86_64
May 18 04:07:40 Installed: perl-Storable-2.45-3.el7.x86_64
May 18 04:07:40 Installed: perl-Exporter-5.68-3.el7.noarch
May 18 04:07:40 Installed: perl-constant-1.27-2.el7.noarch
May 18 04:07:40 Installed: perl-Time-Local-1.2300-2.el7.noarch
May 18 04:07:40 Installed: perl-Socket-2.010-4.el7.x86_64
May 18 04:07:40 Installed: perl-Carp-1.26-244.el7.noarch
May 18 04:07:40 Installed: 4:perl-Time-HiRes-1.9725-3.el7.x86_64
May 18 04:07:40 Installed: perl-PathTools-3.40-5.el7.x86_64
May 18 04:07:40 Installed: perl-Scalar-List-Utils-1.27-248.el7.x86_64
May 18 04:07:40 Installed: 1:perl-Pod-Simple-3.28-4.el7.noarch
May 18 04:07:40 Installed: perl-File-Temp-0.23.01-3.el7.noarch
May 18 04:07:40 Installed: perl-File-Path-2.09-2.el7.noarch
May 18 04:07:40 Installed: perl-threads-shared-1.43-6.el7.x86_64
May 18 04:07:40 Installed: perl-threads-1.87-4.el7.x86_64
May 18 04:07:41 Installed: perl-Filter-1.49-3.el7.x86_64
May 18 04:07:41 Installed: perl-Getopt-Long-2.40-3.el7.noarch
May 18 04:07:43 Installed: 4:perl-5.16.3-294.el7_6.x86_64
May 18 04:07:43 Installed: 2:vim-filesystem-7.4.160-5.el7.x86_64
May 18 04:07:46 Installed: 2:vim-common-7.4.160-5.el7.x86_64
May 18 04:07:46 Installed: gpm-libs-1.20.7-5.el7.x86_64
May 18 04:07:46 Installed: 2:vim-enhanced-7.4.160-5.el7.x86_64
(PRD)[root@centos7 log]#
匹配规则，找到结束时间的第一条日志记录，就立马停止过滤。
(PRD)[root@centos7 log]#cat yum.log
May 18 04:07:39 Installed: 1:perl-parent-0.225-244.el7.noarch
May 18 04:07:39 Installed: perl-HTTP-Tiny-0.033-3.el7.noarch
May 18 04:07:39 Installed: perl-podlators-2.5.1-3.el7.noarch
May 18 04:07:39 Installed: perl-Pod-Perldoc-3.20-4.el7.noarch
May 18 04:07:39 Installed: 1:perl-Pod-Escapes-1.04-294.el7_6.noarch
May 18 04:07:40 Installed: perl-Encode-2.51-7.el7.x86_64
May 18 04:07:40 Installed: perl-Text-ParseWords-3.29-4.el7.noarch
May 18 04:07:40 Installed: perl-Pod-Usage-1.63-3.el7.noarch
May 18 04:07:40 Installed: 4:perl-libs-5.16.3-294.el7_6.x86_64
May 18 04:07:40 Installed: 4:perl-macros-5.16.3-294.el7_6.x86_64
May 18 04:07:40 Installed: perl-Storable-2.45-3.el7.x86_64
May 18 04:07:40 Installed: perl-Exporter-5.68-3.el7.noarch
May 18 04:07:40 Installed: perl-constant-1.27-2.el7.noarch
May 18 04:07:40 Installed: perl-Time-Local-1.2300-2.el7.noarch
May 18 04:07:40 Installed: perl-Socket-2.010-4.el7.x86_64
May 18 04:07:40 Installed: perl-Carp-1.26-244.el7.noarch
May 18 04:07:40 Installed: 4:perl-Time-HiRes-1.9725-3.el7.x86_64
May 18 04:07:40 Installed: perl-PathTools-3.40-5.el7.x86_64
May 18 04:07:40 Installed: perl-Scalar-List-Utils-1.27-248.el7.x86_64
May 18 04:07:40 Installed: 1:perl-Pod-Simple-3.28-4.el7.noarch
May 18 04:07:40 Installed: perl-File-Temp-0.23.01-3.el7.noarch
May 18 04:07:40 Installed: perl-File-Path-2.09-2.el7.noarch
May 18 04:07:40 Installed: perl-threads-shared-1.43-6.el7.x86_64
May 18 04:07:40 Installed: perl-threads-1.87-4.el7.x86_64
May 18 04:07:41 Installed: perl-Filter-1.49-3.el7.x86_64
May 18 04:07:41 Installed: perl-Getopt-Long-2.40-3.el7.noarch
May 18 04:07:43 Installed: 4:perl-5.16.3-294.el7_6.x86_64
May 18 04:07:43 Installed: 2:vim-filesystem-7.4.160-5.el7.x86_64
May 18 04:07:46 Installed: 2:vim-common-7.4.160-5.el7.x86_64
May 18 04:07:46 Installed: gpm-libs-1.20.7-5.el7.x86_64
May 18 04:07:46 Installed: 2:vim-enhanced-7.4.160-5.el7.x86_64
(PRD)[root@centos7 log]#
(PRD)[root@centos7 log]#
(PRD)[root@centos7 log]#sed -n '/04:07:39/,/04:07:40/p' yum.log
May 18 04:07:39 Installed: 1:perl-parent-0.225-244.el7.noarch
May 18 04:07:39 Installed: perl-HTTP-Tiny-0.033-3.el7.noarch
May 18 04:07:39 Installed: perl-podlators-2.5.1-3.el7.noarch
May 18 04:07:39 Installed: perl-Pod-Perldoc-3.20-4.el7.noarch
May 18 04:07:39 Installed: 1:perl-Pod-Escapes-1.04-294.el7_6.noarch
May 18 04:07:40 Installed: perl-Encode-2.51-7.el7.x86_64
(PRD)[root@centos7 log]#