$ exit $ env | grep file_name file_name=test.txt 5. Conclusion In this tutorial, we discussed various examples to clear the value of an exported environment variable. We can use these commands in our shell scripts to make them more robust....
TINY4412 # help setenv setenv - set environment variables -->作用是设置环境变量 Usage: //命令使用方法 setenv name value ... //使用格式 - set environment variable 'name' to 'value ...' //设置环境变量“名称”“数值……格式 setenv name - delete environment variable 'name' //删除...
The setenv() function adds the variable name to the environment with the value value,ifname does not already exist. If name does existinthe environment, then its valueischanged to valueifoverwriteisnon-zero;ifoverwriteiszero, then the value of nameisnot changed. The unsetenv() function del...
Allow users to set arbitrary environment variables env_reset: Reset the environment to a default set of variables env_check: Environment variables to check for sanity env_delete: Environment variables to remove env_keep: Environment variables to preserve role: SELinux role to use in the new secur...
To make the condition true, the rc job must also set the RUNLEVEL environment variable to a value from 2 through 5 (see 6.5.6 Upstart Runlevels and System V Compatibility). 这部分告诉Upstart在接收到来自Upstart的停止rc事件时激活作业,当rc任务作业运行并终止时。 为了使条件成立,rc作业还必须将...
The shell also serves as a small programming environment. Unix programmers often break common tasks into little components and use the shell to manage tasks and piece things together. Shell是Unix系统中最重要的部分之一。 Shell是一个运行命令的程序,就像用户输入的命令一样。
切换目录。cd实际上是shell内置的命令。 cd [DIR] dir可取: 缺省:当前用户主目录。 .:当前目录。 ..:当前目录的上级目录。 -:前一个工作目录。 ~:当前用户主目录。 ~USER:USER用户的主目录。 PATH:绝对路径或相对路径。 cp 复制文件/目录。 cp [-adfprR] SRC[ ...] DST ...
containscontainscontainsPythonPackageuninstall()Directorydelete()EnvironmentVariabledelete() 流程图 下面是Python卸载的流程图: 开始卸载Python包删除Python安装目录删除Python环境变量结束 希望本文对你理解如何在Linux系统下正确卸载Python有所帮助。如果你对Python有其他问题或需求,可以参考官方文档或其他相关资料。
('~' unless overridden by environment variable SIMPLE_BACKUP_SUFFIX) -T, --files-from=FILE get names to extract or create from FILE --unquote unquote filenames read with -T (default) -X, --exclude-from=FILE exclude patterns listed in FILE File name transformations: --strip-components=...
delete mBlitter; } 2.2 Input设备 QLinuxFbIntegration对象创建了一系列Input处理函数:触摸屏、键盘、鼠标等。 voidQLinuxFbIntegration::createInputHandlers() { #if QT_CONFIG(libinput) if (!qEnvironmentVariableIntValue("QT_QPA_FB_NO_LIBINPUT")) { ...