In /usr/bin/xzmore line 37:
oldtty=`stty -g 2>/dev/null`
       ^-------------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
oldtty=$(stty -g 2>/dev/null)


In /usr/bin/xzmore line 45:
	trap 'stty $oldtty 2>/dev/null; exit' 0 2 3 5 10 13 15
                                                    ^-- SC2172: Trapping signals by number is not well defined. Prefer signal names.
                                                      ^-- SC2172: Trapping signals by number is not well defined. Prefer signal names.
                                                         ^-- SC2172: Trapping signals by number is not well defined. Prefer signal names.


In /usr/bin/xzmore line 47:
	trap 'stty $ncb echo 2>/dev/null; exit' 0 2 3 5 10 13 15
                                                      ^-- SC2172: Trapping signals by number is not well defined. Prefer signal names.
                                                        ^-- SC2172: Trapping signals by number is not well defined. Prefer signal names.
                                                           ^-- SC2172: Trapping signals by number is not well defined. Prefer signal names.


In /usr/bin/xzmore line 59:
		< "$FILE" || continue
                ^-------^ SC2188: This redirection doesn't have a command. Move to its command (or use 'true' as no-op).


In /usr/bin/xzmore line 62:
			stty $cb -echo 2>/dev/null
                             ^-^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
			stty "$cb" -echo 2>/dev/null


In /usr/bin/xzmore line 63:
			ANS=`dd bs=1 count=1 2>/dev/null`
                            ^---------------------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
			ANS=$(dd bs=1 count=1 2>/dev/null)


In /usr/bin/xzmore line 64:
			stty $ncb echo 2>/dev/null
                             ^--^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
			stty "$ncb" echo 2>/dev/null

For more information:
  https://www.shellcheck.net/wiki/SC2172 -- Trapping signals by number is not...
  https://www.shellcheck.net/wiki/SC2188 -- This redirection doesn't have a c...
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...