Programmer Think

Less keyword commands used: 1. at: (automatic) represents the automatic execution of a task Example: ``` at 10am mar 31 2015 at> echo "taxes due" At> ^D (ctrl+D for storing the task) ``` atq: Show scheduled tasks atrm job-d: Delete a set tas ...

1. Bilog cleaning of MySQL server 1.1 Using MySQL parameter control expire_logs_days Setting the expiration date of binary log, the log after the specified number of days will be deleted automatically and can be modified dynamically. If a non-zero value is set, binlog file s that exceed the defined number of days may be cleaned up when mysqld ...

In the process of running programs, we often encounter time-consuming and resource-consuming operations. To avoid them blocking the main program, we often use multithreaded or asynchronous tasks.For example, in Web development, when a new user is registered, we usually send him an activation email, which is an IO blocking task. If you put it di ...

10.19 iptables rule backup and recovery service iptables save saves rules to/etc/sysconfig/iptables Iptables-save > target file Save rules to another file [root@arslinux-01 ~]# iptables-save > /tmp/ipt.txt [root@arslinux-01 ~]# cat !$ cat /tmp/ipt.txt # Generated by iptables-save v1.4.21 on Wed Apr 17 19:56:24 2019 *filter :INPUT ACCEP ...