Ranges can only match single char

[xubuntu4iran]

~/Documents/Math/shellcheck-v0.10.0/shellcheck rep-factors.sh 

In rep-factors.sh line 41:
comp=$(sed -n "${j}p" "${filename}" |  jq -r  .[\"input-decimal\"]);
                                               ^-----------------^ SC2102 (info): Ranges can only match single chars (mentioned due to duplicates).

For more information:
  https://www.shellcheck.net/wiki/SC2102 -- Ranges can only match single char...

v0.10.0 stable release used
I used sed to extract a line from a file which is a json object, so I used jq to extract json element

[brother]

I understand what you are reaching towards but this is frankly speaking a pretty lazy and bad issue description.

Ignore the problem with a directive.

[sideeffect42]

Please do not ignore this shellcheck message. It is completely valid and refers to a bug in your shell script.

Please quote your strings properly, single quotes don't hurt.
In your code .["input-decimal"] is interpreted as a shell glob.

Example:

touch .i
echo '{"i": "hello bug"}' | jq -r .[\"input-decimal\"]
# prints hello bug

[brother]

It is completely valid and refers to a bug in your shell script.

We are still guessing though as the issue description is not clear. To me this report is invalid and should be closed.

[sideeffect42]

We are still guessing though as the issue description is not clear.

The intent is pretty clear I think. @xubuntu4iran wants to extract the field "input-decimal" from the JSON object on line $j.

But because he doesn't quote this JQ code correctly it will be interpreted as a glob by the shell and it will blow up in his face if by chance any file matching .[input-decml"] exists.
It's pure luck his code seems to work.

To me this report is invalid and should be closed.

Agreed. 100% not a bug in shellcheck.

[xubuntu4iran]

Description added to first post, @sideeffect42 how to edit my script if it is not a bug

[xubuntu4iran]

Please do not ignore this shellcheck message. It is completely valid and refers to a bug in your shell script.

Please quote your strings properly, single quotes don't hurt. In your code .["input-decimal"] is interpreted as a shell glob.

Example:

touch .i
echo '{"i": "hello bug"}' | jq -r .["input-decimal"]

prints hello bug

for me , it printed null
echo '{"i": "hello bug"}' | jq -r .["input-decimal"]
null

[sideeffect42]

Description added to first post, @sideeffect42 how to edit my script if it is not a bug

@xubuntu4iran: like I had written already, you have to quote your JQ code:

comp=$(sed -n "${j}p" "${filename}" | jq -r '.["input-decimal"]')

Example:
touch .i
echo '{"i": "hello bug"}' | jq -r .["input-decimal"]

for me , it printed null echo '{"i": "hello bug"}' | jq -r .["input-decimal"] null

You have to run the complete example I posted.
First:
touch .i
And then:
echo '{"i": "hello bug"}' | jq -r .[\"input-decimal\"]

Or run just touch .i and then your code and you will see it misbehave.