Within the psa.conf all the Plesk paths are declared, you can see this below. This file is used to declare the location of different utilities, services, and/or packages within Plesk

# Plesk tree
PRODUCT_ROOT_D /usr/local/psa

# Directory of SysV-like Plesk initscripts
PRODUCT_RC_D /etc/init.d

# Directory for config files
PRODUCT_ETC_D /usr/local/psa/etc

# Virtual hosts directory
HTTPD_VHOSTS_D /var/www/vhosts

# Apache configuration files directory
HTTPD_CONF_D /etc/httpd/conf

# Apache include files directory
HTTPD_INCLUDE_D /etc/httpd/conf.d

# Apache binary files directory
HTTPD_BIN_D /usr/bin

#Apache log files directory
HTTPD_LOG_D /var/log/httpd

#apache startup script
HTTPD_SERVICE httpd

# Qmail directory
QMAIL_ROOT_D /var/qmail

# Location of qmail maildirs
QMAIL_MAILNAMES_D /var/qmail/mailnames

# Path to rblsmtpd
RBLSMTPD /usr/sbin/rblsmtpd

# Courier-IMAP
COURIER_IMAP_ROOT_D /

# Proftpd
FTPD_CONF /etc/proftpd.conf
FTPD_CONF_INC /etc/proftpd.include
FTPD_BIN_D /usr/bin
FTPD_VAR_D /var/run/proftpd
FTPD_SCOREBOARD /var/run/proftpd/scoreboard

# Bind
NAMED_RUN_ROOT_D /var/named/run-root

# Webalizer
WEB_STAT /usr/bin/webalizer

# Logrotate
LOGROTATE /usr/local/psa/logrotate/sbin/logrotate

# MySQL
MYSQL_VAR_D /var/lib/mysql
MYSQL_BIN_D /usr/bin

# PostgreSQL
PGSQL_DATA_D /var/lib/pgsql/data
PGSQL_BIN_D /usr/bin

# Backups directory
DUMP_D /var/lib/psa/dumps

# Mailman directories
MAILMAN_ROOT_D /usr/lib/mailman
MAILMAN_VAR_D /var/lib/mailman

# Python binary
PYTHON_BIN /usr/bin/python2.4

# Tomcat root directory
CATALINA_HOME /usr/share/tomcat5

# DrWeb
DRWEB_ROOT_D /opt/drweb
DRWEB_ETC_D  /etc/drweb

# GnuPG binary
GPG_BIN /usr/bin/gpg

# Tar binary
TAR_BIN /bin/tar

# Curl certificates
CURL_CA_BUNDLE_FILE /usr/share/curl/curl-ca-bundle.crt

# AWStats
AWSTATS_ETC_D /etc/awstats
AWSTATS_BIN_D /var/www/cgi-bin/awstats
AWSTATS_TOOLS_D /usr/share/awstats
AWSTATS_DOC_D /var/www/html/awstats

# openssl binary
OPENSSL_BIN /usr/bin/openssl

LIB_SSL_PATH /lib/libssl.so
LIB_CRYPTO_PATH /lib/libcrypto.so

CLIENT_PHP_BIN /usr/local/psa/bin/php-cli

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