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/ppp-status line 5:

xmldbc -P /etc/services/INET/ppp4_status.php -V "IFNAME=$1" -V "STATUS=$2" -V "SESSID=$3" -V "MTU=$4" > /var/run/ppp4_status_$1.sh

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

Did you mean:

xmldbc -P /etc/services/INET/ppp4_status.php -V "IFNAME=$1" -V "STATUS=$2" -V "SESSID=$3" -V "MTU=$4" > /var/run/ppp4_status_"$1".sh

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/ppp-status line 6:

sh /var/run/ppp4_status_$1.sh

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

Did you mean:

sh /var/run/ppp4_status_"$1".sh

For more information:

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

[*] Source file ppp-status