$ if [ -z "$(ls -A projects)" ]; then echo "Directory is empty."; else echo "Directory is not empty."; fi ls -A projects– list all the contents in theprojectsdirectory except for the.and..entries. The.entry represents our current directory while the..entry represents the parent ...
To check for a directory, replace the-foperator (which is used for checking if a file exists or not) with the-doperator. Example 1: A traditional approach Usually, the Bash built-in test operators are used in combination with the if conditional, like I demonstrated above. This has two a...
In programming, it is essential to check if a variable is “set” or “not set,” which means you have to check if a bash script variable has a value or not. This check helps for effective data validation. However, there’s no built-in function for checking empty variables in bash sc...
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 $? The output is1, which means that the directory doesn't exist. Create the directory using themkdir commandand rerun the ...
安装HAP时提示“code:9568344 error: install parse profile prop check error” 问题现象 在启动调试或运行应用/服务时,安装HAP出现错误……欲了解更多信息欢迎访问华为HarmonyOS开发者官网
In order to check if a directory exists in Bash, you have to use the “-d” option and specify the directory name to be checked. if [[ -d "$DIRECTORY" ]] then echo "$DIRECTORY exists on your filesystem." fi As an example, let’s say that you want to check with Bash if the...
执行shell脚本提示“-bash: ./checkP.sh: /bin/sh^M: bad interpreter: No such file or directory”解决方法 在windows机器下新建了一个shell脚本如下 sed -i 's/\r$//' checkP.sh 在Linux上的很多操作一般都是用脚本来实现了,特别是线上的服务器,不用脚本是,直接在上面敲是很危险的,一不小心,手一...
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 "$FILE is a directory." Copy You can also use the double brackets [[ instead of a single...
执行shell脚本提示“-bash: ./checkP.sh: /bin/sh^M: bad interpreter: No such file or directory”解决方法,在windows机器下新建了一个shell脚本如下在Linux上的很多操作一般都是用脚本来实现了,特别是线上的服务器,不用脚本是,直接在上面敲是很危险的,一不小心,手
“$v1 is a directory”. Otherwise, it will be executing the else part of the “if” statement and displaying “$v1 is a file” at the shell terminal. The “fi” states that the “if” statement has been ended here. After saving this bash code, we will be back to the console ...