In /logs/firmware/patool_extraction/DUMP/mtdblock2_unblob_extracted/mtdblock2_extract/0-376832.squashfs_v4_le_extract/opt.local line 4:

export LD_LIBRARY_PATH=/opt:$LD_LIBRARY_PATH

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

Did you mean: 

export LD_LIBRARY_PATH=/opt:"$LD_LIBRARY_PATH"

In /logs/firmware/patool_extraction/DUMP/mtdblock2_unblob_extracted/mtdblock2_extract/0-376832.squashfs_v4_le_extract/opt.local line 7:

	echo $&commat

             ^-- SC2068 (error): Double quote array expansions to avoid re-splitting elements.

In /logs/firmware/patool_extraction/DUMP/mtdblock2_unblob_extracted/mtdblock2_extract/0-376832.squashfs_v4_le_extract/opt.local line 20:

[ "$end" = "" ] && [ "$action" != "" ] || showUsage

                ^-- SC2015 (info): Note that A && B || C is not if-then-else. C may run when A is true.

In /logs/firmware/patool_extraction/DUMP/mtdblock2_unblob_extracted/mtdblock2_extract/0-376832.squashfs_v4_le_extract/opt.local line 38:

	echo -n "Stopping mydlink_watchdog"

             ^-- SC3037 (warning): In POSIX sh, echo flags are undefined.

In /logs/firmware/patool_extraction/DUMP/mtdblock2_unblob_extracted/mtdblock2_extract/0-376832.squashfs_v4_le_extract/opt.local line 40:

	pid=$(pidof $mydlinkdaemon) && { kill -SIGUSR1 $pid && echo " ok." && return 0; }

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

Did you mean: 

	pid=$(pidof $mydlinkdaemon) && { kill -SIGUSR1 "$pid" && echo " ok." && return 0; }

In /logs/firmware/patool_extraction/DUMP/mtdblock2_unblob_extracted/mtdblock2_extract/0-376832.squashfs_v4_le_extract/opt.local line 47:

	echo -n "mydlink_watchdog"

             ^-- SC3037 (warning): In POSIX sh, echo flags are undefined.

For more information:

  https://www.shellcheck.net/wiki/SC2068 -- Double quote array expansions to ...

  https://www.shellcheck.net/wiki/SC3037 -- In POSIX sh, echo flags are undef...

  https://www.shellcheck.net/wiki/SC2015 -- Note that A && B || C is not if-t...