如果管 server 的人，跟在 server 上面放程式的人是不同人，那難免因為更新的問題吵架，為了避免傷害，有時候例如要把 PHP 維持在指定的版本，這時候 pkg lock 就要用到了。
root@foo:~ # pkg lock -y -x 'php5-.*-5.4.35' Locking php5-bcmath-5.4.35 Locking php5-ctype-5.4.35 Locking php5-curl-5.4.35 Locking php5-dom-5.4.35 Locking php5-filter-5.4.35 Locking php5-gettext-5.4.35 Locking php5-hash-5.4.35 Locking php5-iconv-5.4.35 Locking php5-imap-5.4.35 Locking php5-json-5.4.35 Locking php5-mbstring-5.4.35 Locking php5-mcrypt-5.4.35_1 Locking php5-mssql-5.4.35 Locking php5-mysql-5.4.35 Locking php5-mysqli-5.4.35 Locking php5-pcntl-5.4.35 Locking php5-pdo-5.4.35 Locking php5-pdo_sqlite-5.4.35_1 Locking php5-phar-5.4.35 Locking php5-posix-5.4.35 Locking php5-session-5.4.35 Locking php5-simplexml-5.4.35 Locking php5-sockets-5.4.35 Locking php5-sqlite3-5.4.35_1 Locking php5-tokenizer-5.4.35 Locking php5-wddx-5.4.35 Locking php5-xml-5.4.35 Locking php5-xmlreader-5.4.35 Locking php5-xmlrpc-5.4.35 Locking php5-xmlwriter-5.4.35 Locking php5-zlib-5.4.35 root@foo:~ # pkg lock -l Currently locked packages: php5-5.4.35 php5-bcmath-5.4.35 php5-ctype-5.4.35 php5-curl-5.4.35 php5-dom-5.4.35 php5-filter-5.4.35 php5-gettext-5.4.35 php5-hash-5.4.35 php5-iconv-5.4.35 php5-imap-5.4.35 php5-json-5.4.35 php5-mbstring-5.4.35 php5-mcrypt-5.4.35_1 php5-mssql-5.4.35 php5-mysql-5.4.35 php5-mysqli-5.4.35 php5-pcntl-5.4.35 php5-pdo-5.4.35 php5-pdo_sqlite-5.4.35_1 php5-phar-5.4.35 php5-posix-5.4.35 php5-session-5.4.35 php5-simplexml-5.4.35 php5-sockets-5.4.35 php5-sqlite3-5.4.35_1 php5-tokenizer-5.4.35 php5-wddx-5.4.35 php5-xml-5.4.35 php5-xmlreader-5.4.35 php5-xmlrpc-5.4.35 php5-xmlwriter-5.4.35 php5-zlib-5.4.35 smarty-2.6.27 root@foo:~ #
這樣下次用 pkg upgrade 的時候，就可以避免全部變新版本了。
root@foo:~ # pkg upgrade Updating FreeBSD repository catalogue... FreeBSD repository is up-to-date. All repositories are up-to-date. Checking for upgrades (187 candidates): 100% Processing candidates (187 candidates): 1% php5-5.4.35 is locked and may not be modified php5-session-5.4.35 is locked and may not be modified php5-xmlwriter-5.4.35 is locked and may not be modified php5-xmlreader-5.4.35 is locked and may not be modified php5-dom-5.4.35 is locked and may not be modified php5-xml-5.4.35 is locked and may not be modified php5-simplexml-5.4.35 is locked and may not be modified php5-ctype-5.4.35 is locked and may not be modified php5-posix-5.4.35 is locked and may not be modified php5-hash-5.4.35 is locked and may not be modified php5-phar-5.4.35 is locked and may not be modified php5-filter-5.4.35 is locked and may not be modified php5-tokenizer-5.4.35 is locked and may not be modified php5-json-5.4.35 is locked and may not be modified php5-sqlite3-5.4.35_1 is locked and may not be modified php5-pdo_sqlite-5.4.35_1 is locked and may not be modified php5-pdo-5.4.35 is locked and may not be modified php5-iconv-5.4.35 is locked and may not be modified