In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/axis-cgi/overlay_del.cgi line 25:

file=$(echo $* | sed -e 's/\/etc\/overlays\///')

            ^-- SC2048 (warning): Use "$@" (with quotes) to prevent whitespace problems.

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

Did you mean: 

file=$(echo "$*" | sed -e 's/\/etc\/overlays\///')

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/axis-cgi/overlay_del.cgi line 28:

file=$(echo $file | sed 's/\\//g')

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

Did you mean: 

file=$(echo "$file" | sed 's/\\//g')

For more information:

  https://www.shellcheck.net/wiki/SC2048 -- Use "$@" (with quotes) to prevent...

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