How to check the directory is empty or not in a single, ls -A will output the files in the directory, -A makes sure, that . and .. are excluded. wc -m will count the number of chars in the output, if that equals to the string 0, then the directory is empty. This will also ...
[student@studentvm1 testdir]$ File="TestFile1" ; rm $File ; if [ -s $File ] ; then echo "$File exists and contains data." ; else echo "$File does not exist or is empty." ; fi TestFile1 does not exist or is empty. 现在创建一个空文件用来测试: [student@studentvm1 testdir]...
1判断是否是文件夹https://blog.csdn.net/StephenHendery/article/details/79049521import os if os.path.isdir(path): print "it's a directory" elif os.path.isfile(path): print "it's a normal file" else: 删除文件夹 删除文件 文件类型
The /etc directory is a special one in Linux. It contains system-configuration files. You don't want to delete any files from this directory unless you know what you're doing.sudo commandSome Bash commands can only be run by the root user; a system administrator or superuser. If you ...
Check if a Directory Exists in Bash To check if adirectoryexists, switch the-foption on thetestcommand with-d(for directory). For example: test -d /tmp/test echo $? The output is1, which means that the directory doesn't exist. Create the directory using themkdir commandand rerun the ...
- Test if the specified variable has an empty value: [[ -z $variable ]] - Test if the specified [f]ile exists: [[ -f path/to/file ]] - Test if the specified [d]irectory exists: [[ -d path/to/directory ]] - Test if the specified file or directory [e]xists: ...
mkdir 1stDirectory 2ndDirectory 3rdDirectoryYou can also use this to create parent directories at the same time with the -p (or --parents) flag. For instance, if you wanted a directory named 'project1' in another subdirectory at '/samples/bash/projects/', you could run:...
This is most likely not the correct error caused byhttps://github.com/docker/docker/blob/master/daemon/start.go#L142 Where it's not checking if the returned error is mentioning the container command or some other path as not found.
$ type -t if keyword 上面例子中,bash是文件,if是关键词。 快捷键 Bash 提供很多快捷键,可以大大方便操作。下面是一些最常用的快捷键,完整的介绍参见《行操作》一章。 Ctrl + L:清除屏幕并将当前行移到页面顶部。 Ctrl + C:中止当前正在执行的命令。
directory 目錄名。也可以用 -d 指定。 disabled 被禁用的內建命令名稱。 enabled 啓用的內建命令名稱。 export 被導出的 shell 變量名稱。也可以用 -e 指定。 file 文件名。也可以用 -f 指定。 function shell 函數的名稱。 group 組名。也可以用 -g 指定。 helptopic 內建命令 help 接受的幫助主題。