在Linux中搭建服务的时候难免要查看配置文件，一般包含#号的行都是不会被执行的
故我们在查看配置文件的时候，特别的配置文件较长的时候，要用到正则表达式
[root@db code]# more my.cnf # For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html [mysqld] Remove leading # and set to the amount of RAM for the most important data cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. innodb_buffer_pool_size = 128M Remove leading # to turn on a very important data integrity option: logging changes to the binary log between backups. log_bin # These are commonly set, remove the # and set as required. # basedir = ..... # datadir = ..... port = ..... server_id = ..... socket = ..... # Remove leading # to set options mainly useful for reporting servers. The server defaults are faster for transactions and fast SELECTs. Adjust sizes as needed, experiment to find the optimal values. join_buffer_size = 128M sort_buffer_size = 2M # read_rnd_buffer_size = 2M sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
以此代码为例，用正则挑选出对我们有用的行，并且去除空行
[root@db code]# grep -v ^'#' my.cnf |grep -v ^$ [mysqld] Remove leading # and set to the amount of RAM for the most important data cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. innodb_buffer_pool_size = 128M Remove leading # to turn on a very important data integrity option: logging changes to the binary log between backups. log_bin port = ..... server_id = ..... socket = ..... The server defaults are faster for transactions and fast SELECTs. Adjust sizes as needed, experiment to find the optimal values. join_buffer_size = 128M sort_buffer_size = 2M sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES