shell if [ -n]
时间: 2023-11-08 10:57:21 浏览: 35
There seems to be an incomplete command in your question. The `if` statement in shell scripting is typically followed by a condition that evaluates to either true or false, and then a set of commands to execute if the condition is true. The `-n` option is typically used to check if a string is non-empty. So, an example of a complete `if` statement using the `-n` option would be:
```
if [ -n "$var" ]; then
echo "Variable 'var' is not empty."
else
echo "Variable 'var' is empty."
fi
```
In this example, the script checks if the variable `var` is non-empty using the `-n` option. If it is non-empty, the script outputs "Variable 'var' is not empty." Otherwise, it outputs "Variable 'var' is empty."