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/init.d/S19init.sh line 3:

echo -n > /var/etc/resolv.conf

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

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/init.d/S19init.sh line 4:

echo -n > /var/TZ

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

For more information:

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

[*] Source file S19init.sh