watch with piped command executes differently than command itself

What am I doing wrong setting up following watch command? This works: ls -ltr ~/meteofetcher/data/metar/2024/12 | tail -10 | awk '{ print $9 }' | xargs -I {} grep 'LSZH' {} But this watch "ls -ltr ~/meteofetcher/data/metar/2024/12 | tail -10 | awk '{ print $9 }' | xargs -I {} grep 'LSZH' {}" only lets me watch the following error: Every 2.0s: ls -ltr ~... : Fri Dec 20 06:27:05 2024 grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. grep: invalid option -- '-' Usage: grep [OPTION]... PATTERNS [FILE]... Try 'grep --help' for more information. It's probably something to do with the quotation but I tried to do t he same with single quotes outside and double quotes inside and it still doesn't work. This produces the same error (and it shouldn't expand the $ afaik) watch 'ls -ltr ~/meteofetcher/data/metar/2024/12 | tail -10 | awk "{ print $9 }" | xargs -I {} grep "LSZH" {}' Where did I go wrong?