if [ -f /path/to/file ]; then echo "File exists." fi if-else语句 如果需要在满足条件时执行一组命令,在不满足条件时执行另一组命令,可以使用if-else结构: bash 复制代码 if [ 条件 ]; then # 如果条件为真,执行这里的命令 else # 如果条件为假,执行这里的命令 fi if-elif-else语句 当需要检查...
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...
if my_file.exists(): # path exists Or with the os module: import os.path path.exists("myfile.txt") Check for the existence of File or a Directory in Bash How to Check if a File Exists For this example, we have created a file called “myfile.txt” and a directory cal...
For example, to test if the file/tmp/test.logexists, run the following command: test -f /tmp/test.txt The first line executes the test to see if the file exists. The second command,echo, displays the results. The result0means that the file exists, while1means no file was found. ech...
If the if statement is True/False, the user is informed that your given command exists/doesn’t exist in the bash respectively by displaying a message on the console.Use the which CommandUse the which command to check if the specified bash command exists....
Example 4: Check the Existence of the File with the Path Create a Bash file with the following script that checks whether the file path exists or not using the -f operator with the “test” command in the “if” condition. #!/bin/bash ...
cd /git/repo/path git pull # Check if the tag exists in the rev-list. # If it exists output should be zero, # else an error will be shown which will go to the else statement. if [ -z"'cd /git/repo/path && git rev-list $1..'" ]; then echo"gogo" else echo"No or ...
Check if file does not exists if [ ! -f /tmp/users.txt ]; then echo "File not found" fi Parameterize file name in script to check if file doesn’t exist filecheck.sh #!/bin/bash FILEPATH=$1 if [ ! -f "$FILEPATH" ]; then ...
/bin/bash# Check if file existsif[-e"temp.txt"];thenecho"File exists"elseecho"File not found"fi Copy Output: rg@DESKTOP-3KE0KU4:~$ ./test1.sh File exists Explanation: In the exercise above, if [ -e "temp.txt" ]; then: This line checks if a file named "temp.txt" exists in...
此方法将路径作为输入并测试用户的权限。...让我们看下面的示例,该示例使用fs.access()检查给定目录是否存在: const fs = require('fs'); // directory to check if exists const...'does not exist' : 'exists'}`); }); 查看本指南,以了解有关在Node.js应用程序中读写文件的更多信息。 11.8K1...