In /logs/firmware/unblob_extracted/firmware_extract/DIR-600_fw_revb5_214b01_ALL_de_20130122/dir600b_v2.14_d1mg.bin_extract/1179788-3612812.squashfs_v4_le_extract/etc/scripts/upwifistatshlper.sh line 2:

echo [$0] $1 $2 $3 ....

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

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

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

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

Did you mean:

echo ["$0"] "$1" "$2" "$3" ....

In /logs/firmware/unblob_extracted/firmware_extract/DIR-600_fw_revb5_214b01_ALL_de_20130122/dir600b_v2.14_d1mg.bin_extract/1179788-3612812.squashfs_v4_le_extract/etc/scripts/upwifistatshlper.sh line 6:

	if [ $2 == 1 ]; then

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

                ^-- SC3014 (warning): In POSIX sh, == in place of = is undefined.

Did you mean:

	if [ "$2" == 1 ]; then

For more information:

  https://www.shellcheck.net/wiki/SC3014 -- In POSIX sh, == in place of = is ...

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

[*] Source file upwifistatshlper.sh