if:tldr:3f69a

This command is using the if statement in a shell script to check if a variable named "variable" has a non-empty value.

Let's break down the command step by step:

1. if keyword: This starts the if statement block.
2. [[ -n "$${variable}" ]]: This is a conditional expression to check if the variable "variable" has a non-empty value. The -n flag checks if the length of the value is non-zero. The dollar signs and double curly braces ($${}) are used to escape the variable name within the conditional expression.
3. then keyword: This indicates the start of the block of code to be executed if the condition is true.
4. ${echo "Condition is true"}: This is a command to be executed if the condition is true. It is using the echo command to print the message "Condition is true". The dollar sign and curly braces (${}) are used to identify and expand the command.
5. fi: This keyword marks the end of the if statement block.

In summary, this command checks if the variable "variable" has a non-empty value and if true, it prints the message "Condition is true" using the echo command.