for:tldr:c79fc

This command is a bash shell script using a for loop to iterate over a range of values defined by the variables ${from}, ${to}, and ${step}.

Here's how it breaks down:

• for ${variable} in ${{from}..${to}..${step}}; do is the start of the loop declaration. It assigns a value to the variable ${variable} for each iteration, going from ${from} to ${to} with a step size of ${step}. These variables are inside double curly braces {{}} to facilitate the substitution of variable values.

• ${echo "Loop is executed"} is the body of the loop. It denotes the actions to be performed within each iteration. In this case, it just prints the message "Loop is executed". The $ before echo ensures the command is evaluated.

• done marks the end of the loop declaration.

To provide a clearer example, let's assume the following variable values:

${from} = 1, ${to} = 10, and ${step} = 2.

The loop will execute three times because it starts at 1 and goes up to 10 with a step of 2. The value of ${variable} will be 1, 3, and 5 respectively in each iteration.

For each iteration, the loop body will execute the command echo "Loop is executed" which will print the message "Loop is executed" on the console.