Method 1: Theif [ -d $directory ]Command ([Operator) Theif [ -d $directory ]command can be used to check for the existence of a directory. If the specified directory exists, the command will return an exit status of0(true). If the directory does not exist, the command will return ...
/bin/bashif[-d"/path/to/directory"]thenecho"Directory exists."elseecho"Directory does not exist."fi 在上面的脚本中,/path/to/directory是要检查的目录路径。 -d参数用于检查一个文件是否为目录,如果是目录,则返回真值。如果目录存在,echo "Directory exists."将会输出 "Directory exists.", 否则将会输出...
As you can see, I am performing two checks. The first check is to make sure that the Neovim configuration directory exists or not. I intentionally added the logical NOT operator (!) to make the condition opposite. This is me saying "I am only concerned if the directorydoes not exist". ...
您可以使用-a(或&&与[[)测试是否存在多个文件,而不是使用复杂的嵌套if / else结构: FILE=/etc/dockerif[-f/etc/resolv.conf-a-f/etc/hosts];thenecho"$FILEis a directory"fi FILE=/etc/dockerif[-f/etc/resolv.conf&&-f/etc/hosts];thenecho"$FILEis a directory"fi 不使用IF语句的等效变体: [-...
[-d/etc/docker]&&echo"$FILEis a directory." Copy 你也可以使用双括号[[,而不是单括号[。 检查文件是否不存在 与许多其他语言类似,测试表达式可以使用!(感叹号)逻辑非运算符进行否定。 FILE=/etc/dockerif[!-f"$FILE"];thenecho"$FILEdoes not exist."fi ...
To check if a directory exists: if [ -d "$DIRECTORY" ]; then echo "$DIRECTORY does exist." fi To check if a directory does not exist: if [ ! -d "$DIRECTORY" ]; then echo "$DIRECTORY does not exist." fi However, as Jon Ericson points out, subsequent commands may...
For example, to check whether the /etc/docker directory exists, you would use:FILE=/etc/docker if [ -d "$FILE" ]; then echo "$FILE is a directory." fi Copy [ -d /etc/docker ] && echo "$FILE is a directory." Copy You can also use the double brackets [[ instead of a single...
Today, you learned how to check and test if your file exists or not on your Bash! Using the bash test and bash shell test, for short terms, you’ll be able to find them! Find a file or two in no time! You also learned how to test whether a directory still exists!
if (dir.exists("my_test_folder")) { print("The direcoty exists") } else { print("The file does not exist") } We get: [1] "The direcoty exists" Now, let’s do the following exercise. We will check if the directory exists and if not, then we will create a new one...
if [ -f "filename" ]; then echo "File exists." else echo "File not found." fi 上述代码示例中,我们使用-f参数来判断给定的文件是否为普通文件。如果文件存在,则打印 "File exists.",否则打印 "File not found."。 注意:filename是需要检查的实际文件名。