Bash 中的 if..else 语句是这个样子的: if TEST-COMMAND then STATEMENTS1 else STATEMENTS2 fi 如果TEST-COMMAND 为真,那么 STATEMENT1 会被执行;而如果为假,那么 STATEMENT2 就会被执行。对于每一个 if 语句,只能有一个 else 语句与之对应。 让我们给上一个例子加一个 else 语句: #!/bin/bash echo -n...
In contrast to &&, the statement after the || operator will only be executed if the exit status of the test command is false. [ -f /etc/resolv.conf ] && echo "$FILE exist." || echo "$FILE does not exist." Copy Check if Directory Exist The flag -d allows you to test whether...
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...
Here is an example showing the use of an if statement 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 -f option is used to check if the given file exists. If it does exist, the message "...
9. Bash if / else / fi statements 9.1. Simple Bash if/else statement Please note the spacing inside the [ and ] brackets! Without the spaces, it won't work! #!/bin/bash directory="./BashScripting" # bash check if directory exists ...
if [ ! -z err−o!−eapk ]; then 会报出-e无法找到的错误; 而if [ ! -z err]||[!−eapk ]; then 没问题; 整数比较 : -eq 等于,如:if [ "a"−eq"b" ] -ne 不等于,如:if [ "a"−ne"b" ] -gt 大于,如:if [ "a"−gt"b" ] ...
1 testing for file existence bash 6 Check if file exists [BASH] 1 Test existence of files in shell 319 How to check if a file exists in a shell script 0 Check if files exists in a directory 0 Test if a file exists 0 Bash script to test file existence 0 Checking the exi...
x FILETo check if FILE exists and the execute permission is granted. 如果嵌套 您可以在bash脚本中根据需要应用任意多个“ if语句”。也可以在另一个“ if语句”中使用if语句。它被称为嵌套If语句。 例 在此示例中,我们将使用嵌套的if表达式来查找“给定数字是否大于50,并且是否为偶数”。
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....
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 ...