The Bash if statement is a fundamental construct that allows you to control the flow of your scripts based on specific conditions. By leveraging conditionals, such as numeric and string comparisons, and file and directory checks, you can create dynamic and responsive scripts. Additionally, nesting ...
echo "The file does not exist." fi In above example, we are checking whether a file “migratedb.sh” exists or not. If-elif-else Statement In bash script, if you wish to apply multiple conditions using if statement then use ‘ if elif else’. In this type of conditional statement, i...
After saving the file, open the terminal and execute the source FileName.sh command to run the bash script file. Note that the following conditional commands can be used to check and create a folder if it does not exist in bash. Using if Statement The if conditional statement tests whether...
Here is an example showing the use of anifstatement to check if a file exists: if [ -f /path/to/file ] then echo "File exists" else echo "File does not exist" fi In this example, the-foption is used to check if the given file exists. If it does exist, the message "File exi...
if ! test "$FILE"; then echo "does not exist" fi Thank you! I was scrolling endless looking/hoping someone would provide this version :-) You can use!even when using[! G Gulzar You can also group multiple commands in the one liner ...
Why you should not use the || and && operators instead of a Bash If Statement? Detailed Examples & FAQ How to check if a variable exists or is “null”? 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...
For example, let’s say that you want to check if the file “/etc/passwd” exists on your filesystem or not. In a script, you would write the following if statement. #!/bin/bash if [[ -f "/etc/passwd" ]] then echo "This file exists on your filesystem." ...
elif [ -d $file ]; then echo "$file is a directory." else echo "$file does not exist" fi I improved the script a little by adding a check on number of arguments. If there are no arguments or more than one argument, the script will output a message and exit without running rest...
; if ($content === false) { echo '无法读取文件内容'; } elseif (strlen($conte...
Shell script - trying to validate if a git tag exists in a git repository in an if/else statement 我正在为zend应用程序创建部署脚本。 仅当我想验证存储库中是否存在标签以将标签强制加入团队时,该笔录几乎完成了。 目前,我有以下代码: 1234567891011121314151617 # Fist update the repo to make sure ...