In /usr/bin/xzgrep line 49:
  s/'\''/'\''\\'\'''\''/g
              ^-- SC1003: Want to escape a single quote? echo 'This is how it'\''s done'.
                      ^-- SC2016: Expressions don't expand in single quotes, use double quotes for that.


In /usr/bin/xzgrep line 183:
'* | *'&'* | *'\'* | *'|'*)
               ^-- SC1003: Want to escape a single quote? echo 'This is how it'\''s done'.

For more information:
  https://www.shellcheck.net/wiki/SC1003 -- Want to escape a single quote? ec...
  https://www.shellcheck.net/wiki/SC2016 -- Expressions don't expand in singl...