cat 作用:显示某个文件的内容到终端。
案例:
我们把”hello world”写入 “test.txt“,然后用 cat 命令看看文件 “test.txt” 内容:
[root@bianchengshe web]# echo "hello world" > test.txt
[root@bianchengshe web]# cat test.txt
hello world
我们来看看 cat 一个内容比较丰富的文件:
[root@bianchengshe web]# cat web.log
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.7.RELEASE)
2022-09-29 18:56:44.488 INFO 2449397 --- [ main] data.server.App : Starting App v0.0.1-SNAPSHOT on rddata with PID 2449397 (/home/workspace/web/server-0.0.1-SNAPSHOT.jar started by root in /home/workspace/web)
2022-09-29 18:56:44.499 INFO 2449397 --- [ main] data.server.App : No active profile set, falling back to default profiles: default
2022-09-29 18:56:46.863 INFO 2449397 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8090 (http)
2022-09-29 18:56:46.893 INFO 2449397 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-09-29 18:56:46.893 INFO 2449397 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.34]
2022-09-29 18:56:46.998 INFO 2449397 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-09-29 18:56:46.998 INFO 2449397 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2330 ms
2022-09-29 18:56:47.860 INFO 2449397 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
效果展示
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