pid

[shell b <shell2kus@yahoo.com>]

hi all 
when i run one ldap server on default port the pid id
in /var/rum/slapd.pid 
what is the importance of it that is which program
requires it.
if i run more than one server how do trap the pid in a
file like the above  if i have more than one server
running on more one system 
with ps -x command i can know that there are n no of
procecess running 
but should be trapped in a file how 

please guide

thanks
shell


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