In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 5:

START=12

^---^ SC2034 (warning): START appears unused. Verify use (or export if used externally).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 6:

STOP=89

^--^ SC2034 (warning): STOP appears unused. Verify use (or export if used externally).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 9:

USE_PROCD=1

^-------^ SC2034 (warning): USE_PROCD appears unused. Verify use (or export if used externally).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 35:

	[ $log_buffer_size -eq 0 -a $log_size -gt 0 ] && log_buffer_size=$log_size

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

                                 ^-- SC2166 (warning): Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.

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

Did you mean: 

	[ "$log_buffer_size" -eq 0 -a "$log_size" -gt 0 ] && log_buffer_size=$log_size

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 36:

	[ $log_buffer_size -eq 0 ] && log_buffer_size=64

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

Did you mean: 

	[ "$log_buffer_size" -eq 0 ] && log_buffer_size=64

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 46:

	PIDCOUNT="$(( ${PIDCOUNT} + 1))"

                      ^---------^ SC2004 (style): $/${} is unnecessary on arithmetic variables.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 47:

	local pid_file="/var/run/logread.${PIDCOUNT}.pid"

        ^------------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 65:

	PIDCOUNT="$(( ${PIDCOUNT} + 1))"

                      ^---------^ SC2004 (style): $/${} is unnecessary on arithmetic variables.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 66:

	local pid_file="/var/run/logread.${PIDCOUNT}.pid"

        ^------------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 72:

	[ "${log_remote}" -ne 0 ] || return

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

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 77:

	procd_set_param command "$PROG" -f -h "$log_hostname" -r "$log_ip" "${log_port}" -p "$pid_file"

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

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 78:

	case "${log_proto}" in

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

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/log line 80:

		"tcp") [ "${log_trailer_null}" -eq 1 ] && procd_append_param command -0;

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

For more information:

  https://www.shellcheck.net/wiki/SC2034 -- START appears unused. Verify use ...

  https://www.shellcheck.net/wiki/SC2154 -- log_port is referenced but not as...

  https://www.shellcheck.net/wiki/SC2166 -- Prefer [ p ] && [ q ] as [ p -a q...