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			<script type="text/javascript">setTimeout(setShortcut, 2000);</script>
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		<div id="toptb" class="cl">
			<!--{hook/global_cpnav_top}-->
			<div class="wp">
				<div class="z">
					<!--{loop $_G['setting']['topnavs'][0] $nav}-->
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					<a id="switchblind" href="javascript:;" onclick="toggleBlind(this)" title="{lang switch_blind}" class="switchblind"></a>
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qidao123.com ToB IT社区-企服评测·应用市场»论坛 › 主机系统 › linux › shell脚本本领—创建和清空文件
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shell脚本本领—创建和清空文件

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发表于 2024-10-22 23:33:17 | 显示全部楼层 |阅读模式

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写这篇文章的起因是由于在分析一个脚本时,看到这么一句脚本,如下所示
  1. ................................
  2. >$RMAN_BACKUP/script/rman_backup.sql
  3. ................................
复制代码
最开始我以为它就是将文件rman_backup.sql清空,这个类似于 cat /dev/null > $RMAN_BACKUP/script/rman_backup.sql命令。但是实际调试过程发现它的功能不局限于此。其实它的功能为:如果文件不存在时创建这么一个空文件,如果文件存在时清空该文件。猜测编写者就是想通过这么一句简单代码去实现这样的两个功能,他都懒得去写一段逻辑判定:"如果文件不存在就创建空的文件,如果文件存在就清空文件"。说这个脚本精妙吧,倒也谈不上。但是也确实够精简,代价就是阅读起来晦涩难懂。尤其对shell脚本不精通的人。只是shell编程中确实有一些奇淫本领.这里不谈其优点与缺点,存在既是合理。
那么在shell中,有哪些创建文件的本领呢?下面简单总结一下,方便以后编写shell脚本时使用,也方便你阅读shell代码。
方法1

touch命令可以用来创建一个空文件,如果文件已经存在,则会更新当时间戳。
案例
  1. if [ ${MYSQL_SERVICE_EXISTS} -eq 1 ] && [ -f "$MYSQL_SERVICE_FILE" ]; then
  2.     touch /usr/lib/systemd/system/mysqld.service
  3.     chmod 644 /usr/lib/systemd/system/mysqld.service
  4.     cat >/usr/lib/systemd/system/mysqld.service <<EOF
  5.     ..................................
  6.     ..................................
  7. fi
复制代码
一般会用上面这种写法居多,使用最上面那种写法倒是比较少见。另有一些结合重定向符与其它命令实现的,如下所示
  1. ................................
  2. echo  "[error]:`date '+%Y%m%d %H:%M:%S'`> $log_msg" > $LOG_FILE
  3. ................................
复制代码
方法3:

使用tee命令可以用来读取标准输入并将其写入到文件和标准输出。如果文件不存在,tee命令会创建它
案例
  1. printf "it is test!\n" > filename.txt
复制代码
方法4:

使用cat命令创建一个文件,如下所示,这里使用Here Document( filename
案例
  1. >$RMAN_BACKUP/script/rman_backup.sql
  2. rman_backup |tee -a $RMAN_BACKUP/rman_backup.sql
复制代码
方法4

truncate命令可以用来减少文件的大小,将其设置为0字节,从而清空文件。
  1. cat >/usr/lib/systemd/system/mysqld.service <<EOF
  2. [Unit]
  3. Description=MySQL Server
  4. Documentation=man:mysqld(8)
  5. Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html
  6. After=network.target
  7. After=syslog.target
  8.  
  9. [Install]
  10. WantedBy=multi-user.target
  11.  
  12. [Service]
  13. User=mysql
  14. Group=mysql
  15.  
  16. # Have mysqld write its state to the systemd notify socket
  17. Type=notify
  18.  
  19. # Disable service start and stop timeout logic of systemd for mysqld service.
  20. TimeoutSec=0
  21.  
  22. # Start main service
  23. ExecStart=/opt/mysql/mysql8.0/bin/mysqld --defaults-file=/data/mysql/conf/my.cnf $MYSQLD_OPTS
  24.  
  25. # Use this to switch malloc implementation
  26. EnvironmentFile=-/etc/sysconfig/mysql
  27.  
  28. # Sets open_files_limit
  29. LimitNOFILE = 100000
  30.  
  31. Restart=on-failure
  32.  
  33. RestartPreventExitStatus=1
  34.  
  35. # Set environment variable MYSQLD_PARENT_PID. This is required for restart.
  36. Environment=MYSQLD_PARENT_PID=1
  37.  
  38. PrivateTmp=false
  39. EOF
复制代码
方法5

: > filename.txt 这种方式来清空文件.
  1. > mysql_error.log
复制代码
其中:表示什么也不做。前面命令中它会清空文件内容(截断文件);与rm差别,由于rm实际上会完全删除文件。此外,如果文件不存在,则 :>filename.txt 实际上会创建该文件。更多关于这个命令的介绍如下所示,参考What is :>filename.txt Doing?[1]文中内容。
  1. echo ''  > mysql_error.log
复制代码
参考资料[1] 1: https://unix.stackexchange.com/questions/552436/what-is-filename-txt-doing
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