linux - What is "-le" in shell script?

Question

I am going through this code. I would like to know what is meant by -le in the following code segment.

if [ $stage -le 2 ]; then

In one of the questions it says that -le stands for <= of strings, but that is in Perl. Is it the same here as well?

Further, I would like to know if that $stage variable automatically gets updated. It has been initialized to 0 at the beginning, but later, how does that get incremented?

Answer 1

-le in Linux means less that or equal to i.e. <=

Means -le checks if the value of left operand is less than or equal to (<=) the value of right operand, if yes then condition becomes true.

consider:

$a=10
$b=20

then [ $a -le $b ] is true.