As we deleted the folders in the previous section, we now delete the files of the desktop in this section. Now, to delete a file from the desktop, we must first retrieve the directory location using the command where “cd” is used first, followed by space. Then, type “Desktop” and ...
例: [root@oldboyedu~]# history -w#历史命令保存到文件,当前用户的家目录下有一个隐藏文件:.bash_history-d:删除历史命令中的某一条 -d 后面加数字 delete(删除) 例: [root@oldboyedu~]# history -d5#删除第5条历史记录-c:清空历史记录,clear(清除) 例: [root@oldboyedu~]# history -c #清空所有历史...
1[root@localhost example]#bashdb --debug example.sh2bash debugger, bashdb, release4.4-1.0.2git34Copyright2002-2004,2006-2012,2014,2016-2018Rocky Bernstein5This isfreesoftware, covered by the GNU General Public License, and you are6welcome to change it and/or distribute copies of it under cer...
AI代码解释 1def numberOfDirectoriesToKeep=42def webappsDir=newFile('/usr/local/tomcat/tomcat_aps')3def webDirectories=webappsDir.listFiles().grep(~/.*webapps_.*/)4def numberOfWeappsDirectories=webDirectories.size();56if(numberOfWeappsDirectories>=numberOfDirectoriesToKeep){7webDirectories.sort...
printf “$SCRIPT:$LINENO:the command $who is not available –“/“ aborting/n “>&2exit192fi 一般,大部分 Linux 命令只是简单的返回 1 或 0 ,表示失败还是成功。这也许就是你的脚本所需要的所有信息。特殊的错误信息任然显示在标准输出上。
While ShellCheck is mostly intended for interactive use, it can easily be added to builds or test suites. It makes canonical use of exit codes, so you can just add ashellcheckcommand as part of the process. For example, in a Makefile: ...
以下命令使用az storage container delete命令删除单个命名容器,然后在循环中删除多个容器。 Azure CLI az storage container delete\--name$container 获取包含特定前缀的容器列表,并将结果存储到变量中。 Azure CLI containerPrefix="learnbash"containerList=$(az storage container list \--query"[].name"\--prefix...
Command Substitution 命令替換 (Command substitution) 允許以命令的輸出替換命令名。有 兩種形式: $(command) 還有`command` Bash 進行擴展的步驟是執行 command,以它的標準輸出替換它,並且將所有後續的 新行符刪除。內嵌的新行符不會刪 除,但是它們可能會在詞的拆分中被刪除。 命令替換 $(cat file) 可以用...
$(command) 或`command` 在执行命令替换时,bash首先执行命令,然后使用命令的标准输出(删除最后的换行符)替换命令的位置。嵌套的换行符不会在命令替换过程中删除,但可在单字解析期间删除。作为一种特例,如果命令替换是“$(cat file)”,可以使用等价的但更快的“$(<file)”取而代之。
To delete empty lines usingsed, we use the following syntax: sed -i'/^$/d'<filename> Here,-iis the option used to performin-place editing of the file.'/^$/d'is the regex pattern we discussed earlier, enclosed in single quotes. It matches the empty lines and thedcommand deletes th...