Linux 基本命令学习笔记《三》

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Linux 基本命令学习笔记《一》

Linux 基本命令学习笔记《二》

1. 看系统日志（CentOS为例） vi /var/log/messages

例如：

Nov 10 12:46:20 swiftlv51im kernel: [16305] 26 16305 84636 32 54 493 0 postgres
Nov 10 12:46:20 swiftlv51im kernel: [16307] 26 16307 84636 35 54 493 0 postgres
Nov 10 12:46:20 swiftlv51im kernel: [16309] 26 16309 84636 29 54 495 0 postgres
Nov 10 12:46:20 swiftlv51im kernel: [16311] 26 16311 84636 33 54 493 0 postgres
Nov 10 12:46:20 swiftlv51im kernel: [ 5599] 89 5599 22811 249 44 0 0 pickup
Nov 10 12:46:20 swiftlv51im kernel: Out of memory: Kill process 21014 (java) score 285 or sacrifice child
Nov 10 12:46:20 swiftlv51im kernel: Killed process 21014 (java) total-vm:2949880kB, anon-rss:134480kB, file-rss:0kB
Nov 10 12:46:20 swiftlv51im systemd-logind: Removed session 174.
Nov 10 13:01:01 swiftlv51im systemd: Created slice user-0.slice.
Nov 10 13:01:01 swiftlv51im systemd: Starting user-0.slice.
Nov 10 13:01:02 swiftlv51im systemd: Started Session 375 of user root.
Nov 10 13:01:02 swiftlv51im systemd: Starting Session 375 of user root.

2. 查看Linux 系统版本（三个命令，总有一条适合你）

(1) lsb-release -a
(2) cat /etc/issue
(3) cat /etc/redhat-release

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