1、在最后一行加：

sed?-i?'$a\Defaults?logfile=/var/log/sudo.log'?/etc/sudoers

2、替換字符：

sed?-i?'s/Allow?from?.example.com/Allow?from?localhost/g'?/usr/local/xxx/config/apache/extra/httpd-info.conf

3、在匹配行下方幾行開始加：

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

4、刪除匹配性開頭的行：

sed?-i?'/^Defaults?logfile=\/var\/log\/sudo.log.*/d'?/etc/sudoers

5、刪除匹配行，并且刪除前一行，后三行：

sed?-i?'/location?\/nginx-status/,+3d;:go;1,1!{P;$!N;D};N;bgo'?/usr/local/xxx/config/nginx/vhost/default.conf

6、利用字符串匹配取區間

本題可以取以"device"開頭以?"}"結尾，然后將里面的符合要求的字符串過濾計數就可以了。 取區間的方法： sed?-n?'/^device/,/\}$/p'?oldboy.log awk?'/device:?{/,?/}/'?oldboy.log 提示： sed?-n?'/區間開始標識/,/區間結束標識/p'?oldboy.log

7、從多少行到多少行

sed?-n?'16214,24400p'?default.err?>mysqlerr.log

8、將\n換行符替換成空格（sed高級應用很重要）

[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命令擴展： [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

9、刪除空行

sed?'/^$/d'

轉載于:https://blog.51cto.com/net881004/2053962

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