On 2019-06-24 20:18, Fan, ZhijuX wrote:
> Using "-lt" will report the following errors, but "\<" will not
> 3.6: integer expression expected
> 3.7: integer expression expected
>
> if [[ "$origin_version" < "$python_version" ]];then
> It is equivalent to
> if [ "$origin_version" \< "$python_version" ];then
> These two approaches work
>
> Any question, please let me know. Thanks.

You might want to extract the major and minor values and compare them
separately then. The "<" operator in bash does a string comparison,
which I'm not sure is what's wanted here?


>From http://tldp.org/LDP/abs/html/comparison-ops.html :


<

    is less than, in ASCII
    <http://tldp.org/LDP/abs/html/special-chars.html#ASCIIDEF>
    alphabetical order

    *if [[ "$a" < "$b" ]]*

    *if [ "$a" \< "$b" ]*

    Note that the "<" needs to be escaped
    <http://tldp.org/LDP/abs/html/escapingsection.html#ESCP> within a *[
    ]* construct.


-- 
Rebecca Cran