Check if a File Exists: Write a Bash script that checks if a file named "temp.txt" exists in the current directory. If it exists, echo "File exists", otherwise, echo "File not found". Code: #!/bin/bash# Check if file existsif[-e"temp.txt"];thenecho"File exists"elseecho"File n...
1. Check Empty String 1 2 3 4 5 6 1. 2. 3. 4. 5. 6. if [[ -z "$emptyString" ]]then echo "Empty"else echo "Not Empty"fi 1. Here is a reference material from Stackoverflowhttp://stackoverflow.com/questions/3767267/check-if-file-exists 1 2 3 4 5 6 7 8 ...
#!/bin/bash if [ -f "$1" ]; then echo "文件存在" else echo "文件不存在" fi 在上面的脚本中,$1表示第一个命令行参数,即文件路径。通过-f参数判断文件是否存在,如果存在则输出"文件存在",否则输出"文件不存在"。 使用示例: 代码语言:txt 复制 $ bash check_file.sh /path/to/file.txt ...
if stat "/path/to/file" >/dev/null 2>&1; then echo "File exists." else echo "File...
Check if the directory still exists The -d operator allows you to test if a file is a directory. For example, to check if the /etc/filetocheck directory exists, you can use: NOTE: You can also use double brackets [[ instead of [ single brackets. ...
if [ -f $file ] then echo "File exists" else echo "File does not exist" fi # Check if a command is successful if ls then echo "Command succeeded" else echo "Command failed" fi ``` 通过使用if-else语句,用户可以根据不同的条件执行不同的操作。这使得Bash脚本更加灵活和强大,可以满足各种不...
How to check if a file exists? How to check if a directory exists? How to check if a command succeeds or failed? How to do string comparison and check if a string equals to a value? How to check if a string is in an array? How to use the Bash ternary operator? How to negate ...
File Operations Functions: Write a Bash script that defines functions for basic file operations like creating a file, deleting a file, and checking if a file exists. Pass file names as arguments to these functions. Code: #!/bin/bash
echo "$myfile deleted" fi 21. Test if File Exists In order to check if a given file exists, users can perform conditional tests. In this case, we’ll useanifstatement with a-fflag. The flag checks if a given file exists and is a regular file. Start by creating the script file: ...
#Input file _db="/tmp/wordpress/faq.txt" #Output location o="/var/www/prviate/pdf/faq" _writer="~/bin/py/pdfwriter.py" # If file exists if [[ -f "$_db" ]] then # read it while IFS='|' read -r pdfid pdfurl pdftitle ...