root@mw1:/srv/mediawiki/w# sudo -u www-data php /srv/mediawiki/w/maint*/mergeMessageFileList.php --output /srv/mediawiki/config/ExtensionMessageFiles.php --wiki test1wiki
PHP Fatal error:  Uncaught Error: Class 'ExtPipeEsc' not found in /srv/mediawiki/w/extensions/PipeEscape/PipeEscape.php:37
Stack trace:
#0 /srv/mediawiki/w/vendor/composer/autoload_real.php(66): require()
#1 /srv/mediawiki/w/vendor/composer/autoload_real.php(56): composerRequire6c5f198879ef07e41bad5103cfc7e97a('0b2e601e08573c0...', '/srv/mediawiki/...')
#2 /srv/mediawiki/w/vendor/autoload.php(7): ComposerAutoloaderInit6c5f198879ef07e41bad5103cfc7e97a::getLoader()
#3 /srv/mediawiki/w/includes/PreConfigSetup.php(53): require_once('/srv/mediawiki/...')
#4 /srv/mediawiki/w/maintenance/doMaintenance.php(58): require_once('/srv/mediawiki/...')
#5 /srv/mediawiki/w/maintenance/mergeMessageFileList.php(159): require_once('/srv/mediawiki/...')
#6 {main}
  thrown in /srv/mediawiki/w/extensions/PipeEscape/PipeEscape.php on line 37