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