In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/opkg-check-config line 25:

    file_out=`mktemp`

             ^------^ SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

Did you mean: 

    file_out=$(mktemp)

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/opkg-check-config line 45:

awk_lists_dir='$1 == "lists_dir" { print "option lists_dir " $3 ; \

              ^-- SC2016 (info): Expressions don't expand in single quotes, use double quotes for that.

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/opkg-check-config line 54:

awk "$awk_script" < $file_in > $file_out

                    ^------^ SC2086 (info): Double quote to prevent globbing and word splitting.

                               ^-------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

awk "$awk_script" < "$file_in" > "$file_out"

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/opkg-check-config line 57:

    mv $file_out $file_in

       ^-------^ SC2086 (info): Double quote to prevent globbing and word splitting.

                 ^------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

    mv "$file_out" "$file_in"

For more information:

  https://www.shellcheck.net/wiki/SC2016 -- Expressions don't expand in singl...

  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...

  https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of le...