inetd(Internet服务守护程序)是许多提供Internet服务的Unix系统上的超级服务器守护程序.对于每个已配置的服务,它将侦听来自连接客户端的请求.通过生成运行适当可执行文件的进程来提供请求,但是诸如echo之类的简单服务由inetd本身提供.根据请求运行的外部可执行文件可以是单线程或多线程.首先出现在4.3BSD [1]中,它通常位于/usr/sbin / inetd.

请告知什么是服务 – 回声？

>如何禁用或启用此服务？
>如果我们禁用echo服务,那么它将影响哪个进程/其他进程？

thx的建议

tail -20  /etc/inetd.conf 
 # Legacy configuration file for inetd(1M).  See inetd.conf(4).
 #
 # This file is no longer directly used to configure inetd.
 # The Solaris services which were formerly configured using this file
 # are now configured in the Service Management Facility (see smf(5))
 # using inetadm(1M).
 #
 # Any records remaining in this file after installation or upgrade,# or later created by installing additional software,must be converted
 # to smf(5) services and imported into the smf repository using
 # inetconv(1M),otherwise the service will not be available.  Once
 # a service has been converted using inetconv,further changes made to
 # its entry here are not reflected in the service.
 #
 #
 # CacheFS daemon.  Provided only as a basis for conversion by inetconv(1M).
 #
 100235/1 tli rpc/ticotsord wait root /usr/lib/fs/cachefs/cachefsd cachefsd
 # TFTPD - tftp server (primarily used for booting)
 #tftp   dgram   udp6    wait    root    /usr/sbin/in.tftpd      in.tftpd -s /tftpboot

remark – 此grep命令的结果为空：

grep echo /etc/inetd.conf

来自维基百科,(回声协议)

Inetd实现[编辑]在类UNIX操作系统上,一个echo服务器内置在inetd守护进程中.默认情况下,通常不启用echo服务.可以通过将以下行添加到文件/etc/inetd.conf并告诉inetd重新加载其配置来启用它：

echo   stream  tcp     nowait  root    internal
echo   dgram   udp     wait    root    internal