1、在最后一行加:
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sed -i '$a\Defaults logfile=/var/log/sudo.log' /etc/sudoers
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2、替换字符:
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sed -i 's/Allow from .example.com/Allow from localhost/g' /usr/local/xxx/config/apache/extra/httpd-info .conf
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3、在匹配行下方几行开始加:
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sed -i -e '/location ~ \/\\.ht/{n;n;s|$|\n #-------------------------------------------------|}' /usr/local/xxx/config/nginx/vhost/default .conf
sed -i -e '/location ~ \/\\.ht/{n;n;n;s|$|\n location /nginx-status {|}' /usr/local/xxx/config/nginx/vhost/default .conf
sed -i -e '/location ~ \/\\.ht/{n;n;n;n;s|$|\n stub_status on;|}' /usr/local/xxx/config/nginx/vhost/default .conf
sed -i -e '/location ~ \/\\.ht/{n;n;n;n;n;s|$|\n access_log off;|}' /usr/local/xxx/config/nginx/vhost/default .conf
sed -i -e '/location ~ \/\\.ht/{n;n;n;n;n;n;s|$|\n }|}' /usr/local/xxx/config/nginx/vhost/default .conf
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4、删除匹配性开头的行:
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sed -i '/^Defaults logfile=\/var\/log\/sudo.log.*/d' /etc/sudoers
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5、删除匹配行,并且删除前一行,后三行:
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sed -i '/location \/nginx-status/,+3d;:go;1,1!{P;$!N;D};N;bgo' /usr/local/xxx/config/nginx/vhost/default .conf
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6、利用字符串匹配取区间
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本题可以取以 "device" 开头以 "}" 结尾,然后将里面的符合要求的字符串过滤计数就可以了。
取区间的方法: sed -n '/^device/,/\}$/p' oldboy.log
awk '/device: {/, /}/' oldboy.log
提示: sed -n '/区间开始标识/,/区间结束标识/p' oldboy.log
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7、从多少行到多少行
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sed -n '16214,24400p' default.err >mysqlerr.log
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8、将\n换行符替换成空格(sed高级应用很重要)
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[root@localhost ~] # chkconfig --list | grep xyz| awk '{print $1}' | sed 's/\/n/ /g'
xyz_apache xyz_app xyz_clamd xyz_ctasd_in xyz_ctasd_out xyz_dovecot xyz_dspam xyz_mysqld xyz_nginx xyz_openldap xyz_postfix xyz_postgresql xyz_postgrey xyz_redis xyz_spamassassin 方法1: [root@localhost ~] # chkconfig --list | grep umail| awk '{print $1}' | sed ':a;N;s/\n/ /g;ta'
xyz_apache xyz_app xyz_clamd xyz_ctasd_in xyz_ctasd_out xyz_dovecot xyz_dspam xyz_mysqld xyz_nginx xyz_openldap xyz_postfix xyz_postgresql xyz_postgrey xyz_redis xyz_spamassassin 方法2: [root@localhost ~] # chkconfig --list | grep umail| awk '{print $1}' | tr "\n" " "
xyz_apache xyz_app xyz_clamd xyz_ctasd_in xyz_ctasd_out xyz_dovecot xyz_dspam xyz_mysqld xyz_nginx xyz_openldap xyz_postfix xyz_postgresql xyz_postgrey xyz_redis xyz_spamassassin 命令扩展: [root@localhost~] # for i in `chkconfig --list | grep xyz| awk '{print $1}' | sed ':a;N;s/\n/ /g;ta'`; do /etc/init.d/$i status; done
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