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/ppp4_status.php line 2:

<?

^-- SC2188 (warning): This redirection doesn't have a command. Move to its command (or use 'true' as no-op).

^-- SC3031 (warning): In POSIX sh, redirecting to/from globs is 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/services/INET/ppp4_status.php line 3:

/* $IFNAME, $STATUS, $SESSID, $MTU */

^-- 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.

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

Did you mean:

/* "$IFNAME", "$STATUS", "$SESSID", "$MTU" */

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/ppp4_status.php line 7:

$infp = XNODE_getpathbytarget("", "inf", "uid", $IFNAME, 0)

^---^ 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 ppp4_status.php