Why is “[[ 10 < 2 ]]" true when comparing numbers in bash? [duplicate]

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Because you compare strings according to Lexicographical order and not numbers

You may use [[ 10 -lt 2 ]] and [[ 20 -lt 2 ]]. -lt stands for Less than (<). For Greater than (>) -gt notation can be used instead.

In bash double parenthesis can be used as well for performing numeric comparison:

if ((10 < 2)); then echo "yes"; else echo "no"; fi

The above example will echo no

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