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/services/INET/ppp6_ipdown.php line 2:

<? /* $IFNAME, $DEVICE, $SPEED, $IP, $REMOTE, $PARAM */

^-- SC3031 (warning): In POSIX sh, redirecting to/from globs is undefined.

   ^-- SC1127 (error): Was this intended as a comment? Use # in sh.

   ^-- SC2211 (warning): This is a glob used as a command name. Was it supposed to be in ${..}, array, or is it missing quoting?

      ^-----^ 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.

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

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

                                                     ^-- SC2035 (info): Use ./*glob* or -- *glob* so names with dashes won't become options.

Did you mean:

<? /* "$IFNAME", "$DEVICE", "$SPEED", "$IP", "$REMOTE", "$PARAM" */

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/services/INET/ppp6_ipdown.php line 5:

/*add 3g connecttime*/

^---^ SC1127 (error): Was this intended as a comment? Use # in sh.

^---^ SC2211 (warning): This is a glob used as a command name. Was it supposed to be in ${..}, array, or is it missing quoting?

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/services/INET/ppp6_ipdown.php line 6:

$infp = XNODE_getpathbytarget("/runtime", "inf", "uid", $PARAM, 1)

^---^ SC2154 (warning): infp is referenced but not assigned.

      ^-- SC2283 (error): Remove spaces around = to assign (or use [ ] to compare, or quote '=' if literal).

                             ^-- SC1036 (error): '(' is invalid here. Did you forget to escape it?

                             ^-- SC1088 (error): Parsing stopped here. Invalid use of parentheses?

For more information:

  https://www.shellcheck.net/wiki/SC1127 -- Was this intended as a comment? U...

  https://www.shellcheck.net/wiki/SC2283 -- Remove spaces around = to assign ...

  https://www.shellcheck.net/wiki/SC2154 -- infp is referenced but not assign...

[*] Source file ppp6_ipdown.php