basic bahs coding code example

Example 1: bash "=~" example

$ [[ 45 =~ [0-9]+ ]] && echo "45 contains digits"
45 contains digits

$ [[ "hello" =~ [0-9]+ ]] && echo "hello doesnt contains digits"
$ [[ "hello" =~ [a-z]+ ]] && echo "hello contains alphabets"
hello contains alphabets

Example 2: bash linux scripting laguage

#!/bin/bash

num_a=100
num_b=200

if [ $num_a -lt $num_b ]; then
    echo "$num_a is less than $num_b!"
fi