/usr/share/zsh/functions/TCP/ is in zsh-common 5.1.1-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/zsh/functions/TCP/tcp_alias
/usr/share/zsh/functions/TCP/tcp_close
/usr/share/zsh/functions/TCP/tcp_command
/usr/share/zsh/functions/TCP/tcp_expect
/usr/share/zsh/functions/TCP/tcp_fd_handler
/usr/share/zsh/functions/TCP/tcp_log
/usr/share/zsh/functions/TCP/tcp_open
/usr/share/zsh/functions/TCP/tcp_output
/usr/share/zsh/functions/TCP/tcp_point
/usr/share/zsh/functions/TCP/tcp_proxy
/usr/share/zsh/functions/TCP/tcp_read
/usr/share/zsh/functions/TCP/tcp_rename
/usr/share/zsh/functions/TCP/tcp_send
/usr/share/zsh/functions/TCP/tcp_sess
/usr/share/zsh/functions/TCP/tcp_shoot
/usr/share/zsh/functions/TCP/tcp_spam
/usr/share/zsh/functions/TCP/tcp_talk
/usr/share/zsh/functions/TCP/tcp_wait