ps and pstree

$ ps -f -p 712
UID     PID  PPID  C STIME TTY          TIME CMD
spamc   712     1  0 Apr27 ?        00:02:06 /usr/bin/perl
      /usr/sbin/spamd -a -d -u spamc -L -m 20 -P

$ pstree
init-+-apache---6*[apache]
     |-atd
     ...
     |-spamd
     |-sshd-+-sshd---sshd---ksh-+-2*[lynx]
     |      |                   `-mutt
     |      |-3*[sshd---sshd---ksh---screen]
     |      |-sshd---sshd---ksh---ssh
     |      |-sshd---bash---ksh
     |      |-sshd---bash---ksh---mutt
     ...
     |-stunnel---stunnel
     |-syslogd
     `-xinetd