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Linux 中 more 命令的功能
在 Linux 系统中，当我们需要在上面查看文件的时候，我们需要分页显示，这个时候就可以用到这个 more 命令。
more 命令类似 cat，不过会以一页一页的形式显示，更方便使用者逐页阅读，而最基本的指令就是按空白键（space）就往下一页显示，按 b 键就会往回（back）一页显示。
more 命令的基本入门
使用 more 命令，只需要在命令的后面跟上文件名称即可
more fileName看下面这个实例
[root@xtgfgggff logs]# more catalina.2019-08-19.log
Aug 19, 2019 1:32:39 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 1:55:48 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 2:03:11 AM org.apache.catalina.core.StandardServer await
WARNING: StandardServer.await: Invalid command '' received
Aug 19, 2019 2:18:36 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 2:39:43 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 3:00:38 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 3:36:27 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 7:15:48 PM org.apache.catalina.core.StandardServer await
INFO: A valid shutdown command was received via the shutdown port. Stopping the Server instance.
Aug 19, 2019 7:15:48 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-bio-80"]
Aug 19, 2019 7:15:48 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ajp-bio-8009"]
Aug 19, 2019 7:15:48 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
Aug 19, 2019 7:15:48 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a m
emory leak, the JDBC Driver has been forcibly unregistered.
Aug 19, 2019 7:15:48 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
Aug 19, 2019 7:15:48 PM
--More--(6%)查看下一行，请按回车键
查看下一屏，请按空格键
返回查看上一屏，请按 b 键
退出 more 命令，请按 q 键
more 命令搜索字符串的功能
1. 看如下命令：
more catalina.2019-08-19.log -20 +/2019参数说明：
-num 一次显示的行数
+/pattern 在每个文档显示前搜寻该字串（pattern），然后从该字串之后开始显示
[root@xtgfgggff logs]# more catalina.2019-08-19.log -20 +/2019
::::::::::::::
catalina.2019-08-19.log
::::::::::::::
Aug 19, 2019 1:32:39 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 1:55:48 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 2:03:11 AM org.apache.catalina.core.StandardServer await
WARNING: StandardServer.await: Invalid command '' received
Aug 19, 2019 2:18:36 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 2:39:43 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 3:00:38 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 3:36:27 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Aug 19, 2019 7:15:48 PM org.apache.catalina.core.StandardServer await
INFO: A valid shutdown command was received via the shutdown port. Stopping the Server instance.
Aug 19, 2019 7:15:48 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-bio-80"]
Aug 19, 2019 7:15:48 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ajp-bio-8009"]
Aug 19, 2019 7:15:48 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
Aug 19, 2019 7:15:48 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a m
emory leak, the JDBC Driver has been forcibly unregistered.
--More--(5%)2. 在已经显示的文件内容搜索匹配的字符串
2.1: 使用 more 基本查看命令
more catalina.2019-08-19.log2.2: 按下 V 键, 调用 vi 编辑器
结果:--More--(5%)看不见了，进入了 vim 模式2.3: 输入 /, 后面在跟你需要搜索的字符串。
/20192.4：然后按下回车，就搜到你要的字符串了，按 n 是匹配当前文本的下一个字符串
2.5：退出 vim 模式，按 Esc 键，输入:q 就可以退出 vim，返回 more 命令格式
more 命令从指定行开始显示
从第 20 行开始显示 catalina.2019-08-19.log 之文档内容。
more +20 catalina.2019-08-19.log+num 从第 num 行开始显示
more 命令限制每页的行数
查看 catalina.2019-08-19.log 之文档内容，当前屏幕只显示 20 条
more -20 catalina.2019-08-19.log-num 一次显示的行数
当我们按下空格键的时候，会显示下 20 行的内容，但是屏幕终端一共就显示了 40 行的内容，不利于查看，因为刚刚的 20 行内容我们已经看到过了。添加 - c 参数
more -20 -c catalina.2019-08-19.log按下空格键，屏幕终端每次都只会显示 20 条。
Aug 19, 2019 7:15:48 PM org.apache.catalina.core.StandardServer await
INFO: A valid shutdown command was received via the shutdown port. Stopping the Server instance.
Aug 19, 2019 7:15:48 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-bio-80"]
Aug 19, 2019 7:15:48 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ajp-bio-8009"]
Aug 19, 2019 7:15:48 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
Aug 19, 2019 7:15:48 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a m
emory leak, the JDBC Driver has been forcibly unregistered.
Aug 19, 2019 7:15:48 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
Aug 19, 2019 7:15:48 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0] but has failed to stop it.
This is very likely to create a memory leak.
Aug 19, 2019 7:15:48 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1] but has failed to stop it.
This is very likely to create a memory leak.
Aug 19, 2019 7:15:48 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
--More--(7%)-c 显示内容再清除其他旧资料
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