In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/checkprogress.sh line 7:

	echo -n 0

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

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/checkprogress.sh line 13:

. /lib/rcscripts/sh/systemd.sh

  ^--------------------------^ SC1091 (info): Not following: /lib/rcscripts/sh/systemd.sh was not specified as input (see shellcheck -x).

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/checkprogress.sh line 15:

$(init_done)

^----------^ SC2091 (warning): Remove surrounding $() to avoid executing output (or use eval if intentional).

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/checkprogress.sh line 16:

echo -n $?

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

For more information:

  https://www.shellcheck.net/wiki/SC2091 -- Remove surrounding $() to avoid e...

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

  https://www.shellcheck.net/wiki/SC1091 -- Not following: /lib/rcscripts/sh/...